Functions vs procedures in Oracle

Question

can anybody explain what is the main difference between functions and procedures in Oracle? Why must I use procedures if I can do everything with functions?

1. I

Answer 1

1. Procedure may or may not return value but functions return value.

2. procedure use out parameter returnvalue purpose but function returnstatment provide.

3. procedure used manipulation of data but function use calculation of data.
4. procedure execution time not use select statement but function use select statement. These are major difference of it.