Solution:

• ASCII, abbreviated from American Standard Code for Information Interchange, is a character encoding standard for electronic communication.
• ASCII codes represent text in computers, telecommunications equipment, and other devices.
• In standard ASCII-encoded data, there are unique values for 128 alphabetic, numeric or special additional characters and control codes.
• The basic ASCII codes use 7-bits for each character. This gives a total of 128 (27) possible unique symbols. The Extended ASCII character set uses 8-bits, which gives an additional 128 characters (i.e. 256 in total).