MacGyver is synonym for resourceful and creative. If you look those words from the dictionary, you'll see MacGyvers photo and a text: dude, who can make anything out of a roll of duct tape, dental floss and some loose pieces of stone.
That's the whole basic idea for a show. MacGyver (Richard Dean Anderson) is a secret agent, or something, who uses his brain before his brawn always coming up a clever solution on dispatching the baddies without the need of using a gun. Though he might do explosives now and then. ;) Mac's boss is Pete Thornton (Dana Elcar), boss of Phoenix foundation, that seems to dabble in a bit of everything, just like Mac. Another regular character is Jack Dalton (Bruce McGill), Mac's adventurous pilot friend who is often in trouble or is gonna get in one in order to help his friend.
What astonishes me is, that MacGyver has lasted the test of time reasonably well. Sure, there are lots of episodes, that feel a bit campy these days, but in all the series is still very watchable. And this comes from a person, who saw MacGyver for the first time back in 80's as a little kid (I was little under ten when it started in the TV here) and saw the series again in my mid twenties.