A Discord bot is an automated program that performs specific tasks within a server, such as sending welcome messages or moderating interactions. Adding bots to a Discord server can be done without coding by inviting them from online lists like top.gg or using pre-made bots available on the platform. Users can interact with bots by issuing commands or using their built-in functions. Removing bots from a server is similar to removing users, and Zapier provides integrations that automate tasks across multiple apps.