Question

Difference between piecewise linear waves and square waves

Answer 1

Piecewise linear function. In mathematics, a piecewise linear function is a real-valued function defined on the real numbers or a segment thereof, whose graph is composed of straight-line sections. It is a piecewise-defined function, each of whose pieces is an affine function.
Whereas, a square wave is a periodic wave that varies abruptly in amplitude between two fixed values, spending equal times at each.