What is a Robot?
1. A mechanical device for performing a task which might otherwise be done by a human, e.g. spraying paint on cars.
3. (Or "crawler", "spider") A program that automatically explores the World-Wide Web by retrieving a document and recursively retrieving some or all the documents that are referenced in it. This is in contrast with normal web browsers that are operated by a human and don't automatically follow links other than inline images and URL redirection.