Facebook Marketplace is an online platform for buying and selling items with other Facebook users. It is accessible through the Facebook app or website, and allows users to browse and search for items for sale in their local area.

To buy or sell on Facebook Marketplace, users need to create a Facebook profile and be at least 18 years old. They can then list items for sale by uploading photos, a description, and a price. Buyers can message sellers directly to arrange payment and pickup or delivery.

Facebook Marketplace is available in many countries around the world, and has become a popular alternative to other online marketplaces like Craigslist and eBay. However, users should exercise caution when buying or selling on the platform, as Facebook does not guarantee transactions or verify the authenticity of items for sale.