2000 Explorer--won't start
Earlier tonight I went to dinner with friends and my explorer was running fine. I went to leave, and it wouldn't start. Initially I checked the fluids (fine), air filter (not brand new, but not horrible either) and the oil (also fine). I had power, so I don't think it's the battery, and it was trying to start, so I don't think it's the starter. The guy who gave me a jump (which did nothing) took a look and declared it has no "spark". I have no clue what that means, but he sounded like he knew what he was talking about.
So...any ideas? Thanks!