When representing different characters in a digital format, the two most commonly used encoding schemes are ANSI and ASCII. Although both are most times confused to be the same, however, there are some differences between the two. ASCII is the older of the two since it was the first to be developed out of the two.
ASCII or (computing) American Standard Code for Information Interchange differs greatly from ANSI when you consider the number of characters used by each encoding scheme when representing them in a digital format. ASCII uses 7 bits, and that makes 128 to be the maximum number of characters can be represented.
In contrast, ANSI was developed to increase the number of characters that can be represented during character encoding. As a result of this development, the maximum number of characters to be represented has been expanded to 256 since it uses 8 bits. Another difference is that ASCII is very easy to use compared to ANSI.