Abstract is something that exists in thought as an idea.
An abstract is something that exists in thought as an idea, but doesn’t have physical or even concrete actuality. It can also be seen as a summary of points that are usually presented in skeletal form. An abstract can be something that can actually summarize or even concentrate the essential aspects of a larger thing or several things.
The abstract is actually a word that comes from a Latin word that means pulled away or detached, and the idea is that something is detached from physical, or concrete reality.