Don't you know that science fiction can be a complete release from the unsatisfaction from the real world, that is why one should be fascinated with science fiction, even someone with no understanding will understand science fiction itself, the TV shows itself there are many examples of science fiction, they can be familiar with it, even the knowledge they have is not so deep. If people love thing and want to fulfill his or her vast imagination, I advised him or her to read science fiction.

It is as all stories are a way to escape from reality. Sci-fi differs from other fiction because most authors use true basic theories on what could be possible in the future and true basics of real science. It ignites your learning potential and your imagination in a way that other fiction may not.

I'm presuming you mean science fiction as opposed to other fiction. If you mean as opposed to non-fiction, then that's a different argument. (It would also help to know what your usual reading habits are.)

Almost all fiction concepts can be phrased as a "what if." Science fiction and fantasy simply play with more extreme "what if"s than other genre fiction or literary fiction. There is well written SF. There is badly written SF.

The escapism element is an element present in all pleasure-reading, but it generally isn't as simple as a "I would prefer to live in this made-up world to the real one." Quite frankly, most science fiction or fantasy settings would be unpleasant to live in. Conflict is a key element to any story, and with science fiction and fantasy stories, the setting is usually an integral part of the conflict. (Otherwise, there's not much point in using a science fiction setting for the story.)

My purpose in reading fiction is for entertainment. I want to be enthralled and surprised with a book. I prefer reading to television and movies because it is more immersive and usually lasts longer. I'll read most anything, but my personal favorites are science fiction and biographies of explorers. (The two types of book actually have a pretty cool shared history.)

The appeal of different science fiction novels is about as varied as the appeal of different fiction novels and depends strongly on why and how the author wrote the book. There are books I love because they have fantastic characters and relationships. There are books I love because I couldn't predict what was going to happen next. Some of them are just plain funny, others are so tragic I cried through the last third of the novel. Some simply have beautiful writing. And sometimes the underlying concept is just cool.

Science fiction also lets you read scenarios that you simply cannot have in other genres. Many are actually fairly closely tied to history and sociology. For example, first contact novels (what if aliens landed) let the author explore what would happen if we met a new and strange civilization now (as opposed to what happened in the 14th-18th century).* Alternative history allows the author to explore the branches history didn't take. Many, but not all, of those pivot around wars.

Science fiction lends itself to larger-than-life characters and situations. When they are written well, this means you get scenes which are heart-in-throat exhilarating. I also have a much easier time believing that the actions of a character in a science fiction setting can change the course of their world than I do with a character in, say, France.

Science fiction is also very often about hope in the face of extreme conflict/darkness.

Finally, the genre distinction of science fiction is in almost every way primarily a method by which publishers and bookstores can market books to a target audience, and conversely a way to make it simpler for that audience to find books they may be interested in. (A necessity with the ever increasing quantity of books available to the reading public. It's not like each new novel is taking an old novel away.) You find books with strong science fiction or fantasy elements marketed as fiction (or mystery or romance). Many classics such as Gulliver's Travels, Utopia, and 20,000 Leagues Under the Sea would be tucked in under "science fiction and fantasy" if they were published today.

*The Sparrow by Maria Doria Russell is a great first contact novel. It is fairly dark.

**The Honor Harrington books by David Weber get about a zillion points for having the entire French Revolution in Space. They are otherwise pretty pulpy books, and the battle scenes require quick skimming to get through.

On the same vein, and very very meta: There and Back Again by Pat Murphy is my favorite "that's just cool" book. It's The Hobbit in space, and it manages it with extreme elegance.