Distance is an amount of space between things. From a distance, it's hard to tell if someone's wearing a vampire costume or just a chic black outfit.
The noun distance usually refers to physical space in between two objects, like the distance between your parking spot and the entrance to the mall. It can also mean an interval in time, like a distance of two years since you graduated. Another meaning of distance is remoteness, like the distance between you and a close friend who doesn't talk to you much these days. The Latin root is distantia, "a standing apart."