What is the use of using the enctype field when uploading files?

The enctype attribute of the FORM element specifies the encoding type used when submitting form data to the server. The default default value is "application/x-www-form-urlencoded".

This encoding method will urlencode the content before sending the form. (Spaces are converted to "+", and special characters are converted to ASCII HEX values).

For example, if we fill in bb as

firstname in the form field,

the result we get before sending is: bb+%2C%2C

However, this encoding is inefficient when sending large amounts of text, text containing non-ASCII characters, or binary data to the server.

When uploading files, the encoding type used should be "multipart/form-data", which can send text data and also supports binary data upload.

The ENCTYPE attribute value of the browser-side