Slack is a cloud-based team 🏷️#communications-platform organized around searchable, topic-based channels, founded by 📝Stewart Butterfield and spun out of an internal tool built at the game studio Tiny Speck.
The name is an acronym for "Searchable Log of All Conversation and Knowledge." Slack combines persistent channels, private groups, and direct messaging with universal search across files, conversations, and people, and it integrates with a large catalogue of third-party services and community-built apps; teams join through an invite or a shared URL.
Although built for workplace communication, Slack has steadily grown into a community platform as well — a role once filled by message boards and Facebook or LinkedIn groups. Its early launch film was produced by 📝Sandwich Video.