Advice can refer to:
1. An opinion given about what to do, or how to behave;
2. A piece of information, "we received a a news that your sister gave birth";
3. Counseling to perform a specific illegal act, used in criminal law;
4. In complexity theory, an advice is a string with extra information used by Turing machine or other computing device .
The term advice should not be confused with the word advise.
Complexity theory is sometimes used as a broad term addressing the study of complex systems, including subjects such as chaos theory, artificial life, and genetic algorithms