Boolean Algebra - Introduction
Introduction         The algebra of logic, which deals with the study of binary variables and logical operations, and also manipulates them is known as Boolean Algebra... 
 
It states that the interchanging the order of operands in a Boolean equation doesn’t change its result.
i.e., 
➡ (A + B) = (B + A) 
➡ A.B = B.A
Proof:

Hence, (A + B) = (B + A) & A.B = B.A