Science fiction often shortened to sci-fi is a theme in various forms of fiction which use concepts that seem scientific, but are not real. This is a major grouping of fiction and is often contrasted with fantasy.
I was exposed to science fiction at a very young age with films like Star Wars: The Empire Strikes Back, Tron, and Dune. This got me acclimated to sci-fi and I continued to enjoy it as I got older with Star Trek: The Next Generation and many others. As I got more into books in my late 20s and early 30s, I began reading many of the best loved sci-fi titles. One of the things I especially love about sci-fi is that it frequently delves into philosophical thought experiments and issues with sociology and depicts them in a way the general public can understand. For example, the Star Trek: TNG episode "The Outcast" which was shown on network television in 1992, pretty transparently deals with transgenderism and conversion torture.