Add may refer to any of the following:
1. When referring to computers, add often refers to adding a hardware device or software program to the computer.
2. Alternatively referred to as addition, add is a math operation that takes two or more different numbers and outputs their total value. For example, 10 + 4 = 14. On a computer you can add numbers using a calculator program and the addition symbol.
In many programming languages the addition operator ( += ) can be used as a way to add to a previous value. For example, in the below Perl code the $example variable is first set to a value of "2". The next line use the addition operator to add "2" to the variable.
$example = 2; $example += 2; print "Total = $example\n";
When the above script is executed the computer would print out "Total = 4" to the screen.
3. Add is an online gaming term to describe aggro.