The browser and server include content-type information in the headers they send to each other. The content-type field describes the data contained in the body of the transaction. The content-type field describes the data fully enough so the receiving user agent can pick an appropriate agent or mechanism to present the data to the user, or otherwise deal with the data in an appropriate manner. The content-type header field specifies the nature of the data in the body of an entity. This header field gives the type and subtype identifiers.
Parameters are modifiers of the content-subtype.
Parameters provide auxiliary information that may be required for certain types. Table 6 describes the most essential characteristics of the seven content types. Important Parameters Text Represents text in a number of character sets and formatted text description languages in a standardized manner. Plain, html charset Multipart Combines several body parts, possibly of differing types of data, into a single message. To encapsulate a message.