The noun alignment refers to the correct positioning of something. If you check the alignment of your feet when running, you're checking to make sure they're not pointing to either side, but going straight ahead.
Alignment has to do with adjusting something so it's in the right place. If you take your car in for a wheel alignment, the mechanic will make sure the wheels are on straight. Alignment can also mean following directions or being in agreement. Your school has to act in alignment with state education rules. If you and your brother both believe that poodles should be banned in your town, then you are in alignment on the issue of poodles.