What does escape in javascript mean?

Description
Encode String objects so that they can be read on all computers,
Syntax
Escape (charstring)
The charstring parameter is a String object to be encoded.

Description
Escape returns a New String object (in Unicode format) containing charstring content. All spaces, punctuation marks, accents, and other non-ASCII characters are replaced by % xx encoding, xx indicates the hexadecimal number of the character. For example, "% 20" is returned by a space ".
The characters with a value greater than 255 are stored in % uxxxx format.