Question 647816
In simple terms,

the domain is all the values of 'x' that define the function
the range is all the values of 'y' that define the function

For example, if you're given a list of points and asked to find the domain and range, you'll have to do this:

Given: (3,5), (7,10), (6,4)

Find the Domain and Range.

Domain (all the 'x' values): 3, 7, 6
Range (all the 'y' values): 5, 10, 4

The relation is a function because for every 'x' value, there is one 'y' value.