I read SF for a number of reasons:
- I love that SF encourages me to look at the world differently.
 - I love the sense of wonder that infuses so much SF.
 - I love that SF stretches my mind and my heart.
 - I love that it’s sometimes so bizarre and yet manages to stay believable.
 
Characteristics of SF:
- Literature of ideas, full of thought experiments. 'What if' is a very important question.
 - Speculates on science - hard and soft - and technology, and humanity’s relationship to them.
 - Explores ethics - often through a good cautionary tale. Perhaps just because we can do something doesn’t mean we should.
 - Tells a good story with lots of interesting characters, settings, and events.
 
Ultimately, Science Fiction is about us - human beings - who we are, what we are, and our relationships to other life, society, technology, and the world around us.