Abstract refers to a summary or a condensed version of a study that describes its most important aspects, including major results and conclusions.

An abstract also highlights the major points covered, concisely describes the content and Scope of the study, and reviews the contents.

Other /More definition:
Abstract refers to a short summary at the beginning of a journal article that informs the reader about what was done - the methods and results.

Moreover, an Abstract is a brief summary of a research article or research study which generally begins the article and states the purpose of the research, the methods used, and the major findings totalling no more than 120 words.