A writing system is a system of symbols that are used to represent language.
Logographic system [change]
A logographic system, is a writing system with symbols that mean whole words, symbols that represent things or ideas. These symbols are called logogram or logograph. An example for a logographic writing system is the system used for the Chinese language.
An alphabet is a writing system with symbols that mean a sound. An example for an alphabetic writing system is the Roman alphabet, which is used in large parts of the world.