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F(x) is 1 for 0<x< pi , 0 for pi < x < 2pi and f(x+2pi) = f(x) for all x

I know that it means that the period is 2pi and L = 2pi/2 = pi

1) Sketch f(x) for -4pi <x < 4pi

I sketched the graph so that is alrite

2) Find the Fourier series for f(x)

This is where it gets confusing. What is f(x)?? what is the function? Is it a unit step function or what?

Thanks.