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What is a Bot
From Elxis Official Documentation
A Bot (or Mambot) is a small program that is executed immediately before any content item is displayed in the website front end. The program can manipulate the output, and replace special tokens or tags embedded in the content with some kind of functionality or formatting. For example, there is a built-in bot which allows you to include images in your content and an other one which allows you to insert youtube videos. Bots are usually implemented in content by inserting a special tag delimited by curly braces, and can have parameters which allow you to configure how the bot works. For better performance of your Elxis site if you don't use a bot you should better unpublish it as published bots are continuously search all content items for tags to replace and this leads to Elxis execution time increase.