Hi there! Lets talk science.Science fiction (often shortened to SF or sci-fi) is a genre of speculative fiction, typically dealing with imaginative concepts such as futuristic science 
I'm familiar with it! I love the sci-fi tv shows. 12 Moneys and Lost are two great science fictions series.
sci-fi film is a genre that uses speculative, fictional science-based depictions of phenomena that are not fully accepted by mainstream science, such as extraterrestrial lifeforms, alien worlds, extrasensory perception and time travel
Right. I think of it as out-of-the-ordinary. Time travel and extraterrestrial beings are really intriguing!
Moreso, sci-fi  often explores the potential consequences of scientific and other innovations, and has been called a "literature of ideas".
Yep! Sci-fi seems to explore many innovations that aren't even possible, like reversed-aging.
Historically, science-fiction stories have had a grounding in actual science,
Yes! Then the stories just get wacky based on some actual science as groundwork!