But watch out. This can be useful if your texture is too small. The 'Filter' can blur your texture to reduce pixelation, but if your texture is the right res, be careful. Now this example may seem simplistic, but that's the point. It is never really gets any more complicated that this.
Lets look at that stone wall which the door is inset within.
Thus its texture needs to be 1920x240 if we were to use a single texture to cover the whole thing. But instead of dealing with such a large texture, I used a 256x256 texture which is repeated four times horizontally. If we are never going to have the entire wall in frame at once, the repeats will be much less noticeable.