Step functions get their name because they look like stairs. We graph one by first locating the y values. Then, we look to see which x values they are between. We typically see an open circle on one side of the graph and a closed circle on the other side of the graph.
Step functions have a domain of all real numbers - for every step function that you're going to see. The range of a step function can be found by locating the smallest and the largest number in the y-values that the problem gives to you.
Step functions only LOOK hard because there are many signs and numbers. Once you've gotten the hang of it - it's very easy!
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