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domain:
range:
function? what is the domain

Domain are any value of x that's make y to be defined

Step-by-step explanation:

The domain can be defined as the complete set of values for the independent variable (x), which is represented in the horixontal axis in the coordinates system.

Also, the domain is the set that defines the range, which is the set of values that works as the result of "processing" the domain values in a relation called function.

Basically, functions are relations between these two sets, the domain and the range, the domain are all input values valid for the relation, and the range are all output values that you get.