[0]
Operators are symbols that tell the compiler to perform specific mathematical 
or logical manipulations.
We can catagorize operations in these types:
1. Arithmetic
2. Relational
3. Bitwise
4. Logical
5. Assignment
6. Increment
7. Miscellaneous

[1]
In computer programming, operators are constructs defined within programming 
languages which behave generally like functions, but which differ syntactically
or semantically.

Common simple examples include arithmetic (e.g. addition with +), comparison 
(e.g. "greater than" with >), and logical operations (e.g. AND, also written
&& in some languages). More involved examples include assignment (usually = or 
:=), field access in a record or object (usually .), and the scope resolution
operator (often :: or .). Languages usually define a set of built-in
operators, and in some cases allow users to add new meanings to existing
operators or even define completely new operators.