The Difference Between a Blurb and a Synopsis
A blurb is a short few sentences or paragraphs that entice the reader to want to know more and to read the story. A synopsis provides far more details of the book and will explain the characters, motives, main plot points, and themes of the story. Many publishers will ask for a blurb and a synopsis of your manuscript, although some may ask for only one or the other.
The difference is a blurb is a summary of the emerging crisis or events that start the story and its relation to the protagonist. While it does not include many details, its main purpose is to pull the reader in and make them want to read your work.
Meanwhile, the synopsis explains in detail each of the characters, the plot points, story arcs or narrative structure, and the relevant themes exposed in the story. A synopsis will generally be at least two pages long and show potential publishers that you know your characters, have planned your story structure well and understand the themes that bring a touch of humanity into your writing. A synopsis may also discuss potential markets, the audience your work is aimed at and show publishers you know who will be likely to read your book.