Domain: The set of all real numbers We can plug in any x value we want and there aren't any restrictions. There aren't any holes, jumps, gaps, or asymptotes
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Range: Only one value is in the range and it is the value 2. We can write this as {2}. The curly brackets indicate "set". It is possible to have a set of only 1 item inside.
The range is the set of y value outputs. In this case, the output is 2 because we have a horizontal line. No matter what the x input is, the output is always 2. This is known as a constant function. The output is constantly the same.
