Craigslist is a classified advertisements website founded in 1995. It covers over 70 countries and 700 cities. Users can create posts for jobs, housing, items for sale, and other categories. The document provides instructions for creating a Craigslist user account, posting and managing ads, and notes on safety and effective posting practices. Key details include requiring email confirmation to create an account, logging in to edit or repost ads, and choosing accurate location categories to avoid flagged posts.