Issues related to how the World Wide Web works:
Based on a client-server model
HTTP is a connectionless protocol. This differs from FTP which establishes an authenticated connection for the duration of a session.
MIME types are used to identifiy different types of data. What we call a MIME type is really a type/subtype pair.
The type has a value such as text or image and the subtype can have values such as html or plain in the case of the text type; and gif or jpeg in the case of the image type.