Answer:
Factoring is written as the product of simpler expressions/factors.
Explanation:
Factoring (called "Factorising" in the UK) is the process of finding the factors.
Factoring is the method of finding what to multiply together to get an expression.
It is like "splitting" an expression into a multiplication of simpler expressions.
Example: factor 

Both 
 and 6 have a common factor of 2:
 and 6 have a common factor of 2:
 is 2 × y
 is 2 × y
6 is 2 × 3
So we can factor the whole expression into:

So 
 has been "factored into" 2 and y+3.
 has been "factored into" 2 and y+3.