Paraphrasing is restating someone else’s ideas in your own words while providing proper in-text citations and references to acknowledge the original source, and let the readers know that the idea is not yours. It plays an important role in academic documents, legal documents, articles journals, etc. It requires crucial thinking, understanding and writing skills to rephrase a document in your own words.
A summary is a concise version of a long detailed text while keeping the context clear. A summary can also be called an abstract, synopsis, executive summary or recap of the original. It highlights the main points of the original text, but it is smaller than the main article.