Welcome, Curious 1981.
As far as your question, I found it rather general. In what regard? I could literally talk all day about autism. I guess a good place to start off is that ASD's are a developmental disorder, and it affects social skills. Aspies learn social skills intellectually and do not pick them up intuitively the way neurotypicals do. Aspies have a hard time multi-tasking, they have the tendency to get obsessed with things, they're easily overloaded if they have to do a lot of different tasks day in and day out, and they tend to be less emotional and more logical than nuerotypicals. They have a hard time interacting with lots of people day in and day out. It's been proven that many engineers have aspergers. It really fits the stereotype of the unsociable engineer who would rather design things than work with people. Your boyfriend's son is just an engineer type person. That's all aspergers means. (Also, some autistics have delayed speech development, e. g. they don't say their first word until they're three or four.) Autistic spectrum people can be engineers, computer programmers, college professors, and many other successful professions. They tend to have above-average I. Q.'s and have sensitivity issues with light, sound, and touch. Some of them have very little sensitivity to pain.
If you have any other specific questions, don't hesitate to ask.