What is the meaning of this phrase?

Question

'Del’ is for deleting a variable when you have too much space use up. For example, each variable you make uses 4 bytes. So if you have 3 variables, A,B and C, it would use up 12 bytes. A function may only have a capasity of 100 bytes, so you can only run those three variables 8 times. ‘Del’ is for deleting those variables to free up space.