Except ASCII and EMBDIC are there other popular coding schemes used for the Internet application?

Answer 1

ASCII is very common. EMBDIC is hardly so.

However, ASCII has been almost completely replaced by Unicode, which is by far the most common encoding scheme anywhere. Unicode comes with several variations (UTF-8, UTF-16, UTF-32, etc). UTF-8 is an 8-bit extension of the 7-bit ASCII coding scheme and allows the encoding of any arbitrary character available in Unicode. The different formats UTF-16 and on are primarily used to encode characters in a different language that will almost always require subsequent bytes.