What is ASCII, and how does it differ from Unicode?

What is ASCII, and how does it differ from Unicode?

• A. ASCII is an 8-bit encoding that supports 256 characters.
• B. Unicode is limited to English characters only.
• C. ASCII is a 7-bit encoding for 128 characters; Unicode is a universal encoding standard supporting thousands of characters from many languages.
• D. ASCII is used for video encoding.

Answer: (C)

Text encoding standards determine how characters are represented in digital form. ASCII is a small, early text encoding that uses 7 bits to represent 128 characters, mainly English letters, digits, and some control symbols. Because it’s 7-bit, it can’t natively represent most symbols or characters from other languages. In practice, many systems store ASCII data in a full 8-bit byte, leaving the eighth bit unused, which can make it seem like an 8-bit scheme even though its core design is 7-bit. Unicode is a much broader system designed to cover characters from virtually every language and script. It assigns a unique code point to each character, enabling thousands of possibilities. Unicode isn’t a single 8- or 16-bit encoding; it’s a standard that describes characters, while practical encodings like UTF-8, UTF-16, and UTF-32 implement those code points in bytes. A lot of ASCII characters appear as the same code points in Unicode, so ASCII text is compatible with Unicode. That’s why the correct idea is that ASCII is a 7-bit encoding for 128 characters, and Unicode is a universal encoding standard supporting thousands of characters from many languages. The other statements mix up ASCII’s size, misstate Unicode’s scope, or mislabel its purpose.

Text encoding standards determine how characters are represented in digital form. ASCII is a small, early text encoding that uses 7 bits to represent 128 characters, mainly English letters, digits, and some control symbols. Because it’s 7-bit, it can’t natively represent most symbols or characters from other languages. In practice, many systems store ASCII data in a full 8-bit byte, leaving the eighth bit unused, which can make it seem like an 8-bit scheme even though its core design is 7-bit.

Unicode is a much broader system designed to cover characters from virtually every language and script. It assigns a unique code point to each character, enabling thousands of possibilities. Unicode isn’t a single 8- or 16-bit encoding; it’s a standard that describes characters, while practical encodings like UTF-8, UTF-16, and UTF-32 implement those code points in bytes. A lot of ASCII characters appear as the same code points in Unicode, so ASCII text is compatible with Unicode.

That’s why the correct idea is that ASCII is a 7-bit encoding for 128 characters, and Unicode is a universal encoding standard supporting thousands of characters from many languages. The other statements mix up ASCII’s size, misstate Unicode’s scope, or mislabel its purpose.