What is difference between standard ASCII and extended ASCII?

Standard ASCII (American Standard Code for Information Interchange) uses 7 bits to represent characters, allowing for 128 unique symbols, which include control characters and printable characters like letters, digits, and punctuation. Extended ASCII, on the other hand, uses 8 bits, enabling 256 characters, which includes the original 128 standard ASCII characters plus an additional set of 128 characters for various symbols, accented letters, and graphics, varying by specific encoding schemes like ISO-8859-1 or Windows-1252. This expansion allows for better support of international languages and special symbols.