Communication & Collaboration

Slack

Slack is a workplace communication platform for organizing team messages, project discussions, quick audio or video sessions, shared files, automated workflows, and connected business applications.

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✓ Software download·Freemium·Updated October 10, 2026
DeveloperSlack Technologies, LLC
LicenseFreemium
File size159 MB
LanguageEnglish
Downloads500,000

Organized Messaging for Collaborative Work

Slack organizes workplace communication into searchable channels, direct messages, threads, and shared collaboration spaces. Teams can create channels around projects, departments, incidents, clients, or recurring processes, keeping each discussion close to its related files and decisions. Direct messages handle focused conversations, while threads separate detailed replies from the main channel flow. Slack also supports quick audio and video huddles, document-style canvases, task-oriented lists, workflow automation, and connections to external business applications. This structure gives distributed teams a persistent record of work and makes it easier to locate context than relying on disconnected email chains, private notes, and separate chat tools.

The Windows desktop client relies on a persistent internet connection and a supported operating system to receive messages and workspace updates. Slack revises its support requirements regularly, so administrators should check the current lifecycle policy before deploying a specific desktop release. Organizations comparing chat-centered and meeting-centered collaboration can review Microsoft Teams to understand how the two platforms structure communication differently. Available message history, huddle capabilities, storage, automation, security controls, and administrative tools depend on the selected subscription. Notification preferences, channel conventions, and user groups should be configured deliberately because active workspaces can otherwise generate unnecessary interruptions and make important conversations harder to identify.

Benefits of Using Slack

The main benefit of Slack is faster access to the people, decisions, and working context needed to move a task forward. Public and private channels give each project or function a durable communication space, reducing repeated status requests and making relevant discussions easier for authorized members to find. Threads keep detailed replies attached to their original message, while search helps recover previous answers, files, and decisions. Huddles let colleagues switch from typing to an informal audio or video conversation without arranging a separate meeting, and canvases provide room for plans, reference material, or meeting notes. Slack integrations can bring notifications and actions from external services into the workspace, while Workflow Builder can automate routine collection, approval, and handoff steps on eligible plans. Configurable notifications help individuals protect focused time, and Slack Connect supports controlled collaboration with approved customers, vendors, and partners outside the organization.

Slack features

Key capabilities and highlights.

Feature 1

Channels and Threads

Slack channels organize conversations by project, team, topic, or business process, while threads keep detailed replies attached to a specific message. Public channels broaden access to shared context, and private channels restrict sensitive discussions to approved members. This structure reduces unrelated chatter and preserves decisions where colleagues can find them later.

Feature 2

Direct Messaging

Direct messages support focused conversations between individuals or small groups without creating a permanent project channel. Participants can exchange formatted text, files, reactions, and links, then start a huddle when typing becomes inefficient. Workspace retention and access policies determine how message history is preserved and governed.

Feature 3

Audio Video Huddles

Huddles provide informal audio conversations that begin inside a channel or direct message. Participants can enable video, share a screen, exchange messages in the associated thread, and use reactions during the session. The feature helps resolve quick questions or review work together without scheduling a formal calendar meeting.

Feature 4

Searchable Message History

Search tools help users locate previous messages, files, people, channels, and shared information across accessible workspace content. Filters can narrow results by sender, location, date, or other criteria. Slack therefore turns past conversations into reusable knowledge, although the amount of searchable history depends on the workspace plan and retention settings.

Feature 5

Workflow Builder

Workflow Builder automates recurring processes such as collecting requests, sharing onboarding information, gathering feedback, and routing approvals. Workflows can use forms, messages, conditional steps, connected services, and approved integrations. Availability varies by subscription and administrator policy, but configured workflows can reduce repetitive coordination and standardize common team procedures.

Feature 6

Canvases and Lists

Canvases provide formatted spaces for project plans, meeting notes, reference material, images, links, and other information that exceeds a normal message. Lists organize tasks and project items with fields, assignments, and collaborative updates. Together, these tools keep lightweight documentation and work tracking close to the relevant conversations.

Feature 7

App Integrations

Slack connects with approved third-party and internal applications so teams can receive notifications, access information, and trigger actions from their workspace. Shortcuts and application commands can reduce switching between services during routine work. Owners and administrators control which integrations are permitted and what data or capabilities each application may access.

Feature 8

External Partner Channels

Slack Connect allows approved organizations to collaborate with customers, suppliers, agencies, and other partners through shared channels. Participants can communicate in a common workspace while remaining associated with their respective organizations. Invitations, permissions, retention behavior, application access, and security controls depend on each organization’s plan and administrative configuration.

Old versions

Browse historical releases and previous builds.

4.52.171September 28, 2026
4.52.162September 9, 2026
4.52.155August 31, 2026
4.51.1912026-08-17
4.51.1852026-07-30
4.51.1802026-07-20
4.50.143—
4.50.1402026-06-15
4.50.136—

Frequently asked questions

Common questions about Slack.

What is Slack used for?

It is used for workplace messaging, project channels, searchable discussions, file sharing, informal audio or video sessions, lightweight documentation, task tracking, workflow automation, and communication with approved external organizations.

Is Slack free to use?

Yes. A free plan provides core communication capabilities, while paid plans expand message history, integrations, automation, administration, security, and other features. Limits and plan contents can change, so verify the current pricing page before selecting a subscription.

What is the difference between a channel and a direct message?

A channel creates an organized space for a topic, project, or team and can make its history available to authorized members. A direct message is better for focused communication between an individual or small group. Important project decisions are generally easier to discover when recorded in an appropriate channel.

Can Slack make audio and video calls?

Yes. Huddles support audio conversations and can add video, screen sharing, reactions, and a related message thread. Participant limits and available controls depend on the workspace subscription, client support, and administrator settings.

Does the Windows app work offline?

The desktop client requires a persistent network connection for messaging and synchronization with the service. Previously loaded content may remain visible temporarily, but sending messages, receiving updates, running integrations, and retrieving cloud content require connectivity.

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Slack is a workplace communication platform for organizing team messages, project discussions, quick audio or video sessions, shared files, automated workflows, and connected business applications.