What are variables?

something that can be changed, like in an experiment. there are controlled variables, manipulated variables and respondingvariables. Something that you could of done better or needed improvement on and then there's something that you did great. Variables are unknowns. They are typically found in math problems and represented by a letter, usually x. They can be fulfilled by any number that makes the equation true. Sometimes they have one discrete value, and other times it is possible that one variable could have several possible values that are all equally correct.
Something that can be changed. In algebra, it is the letter because the letter can be changed to a number.