i got you.
for what it's worth there is a lot of people posting fire in here which is great, however if you really haven't listened to jazz for a long time or haven't learned how to play an instrument in the style of jazz or have any real musical theory background then it may be hard for you to really appreciate what people have been posting.
I mean you will probably like what you hear, but the beauty is in understanding WHY you like it... kinda like how someone can hear a rap verse and like it whilst not fully appreciating the metaphors, wordplay, flow yadayada.. jazz is like that on steroids.
^ this is a breakdown of Giant Steps (which some people have already posted, but this goes into why it's a great jazz song in detail and will introduce a bunch of concepts to you).
^this is harmony being explained to 5 different levels of people (a child, a teenager, a music pro and then HERBIE HANCOC) this is a breakdown of harmony which is only one element to jazz music but a very important one.. i just really like the video and you might learn something or two.
I would suggest you seek out more material like this to get an understanding.
Once you have done that, you should be listening to what people already posted.. my personal favourites are thelonius monk, herbie hancock and miles davis.
The more you delve in, the more you will understand. You can check out forums, watch videos and listen to a bunch of music... the next step would be to learning an instrument, checking out live jazz musicans and shyt all that.
Whenever you're watching videos like the ones i posted, try and apply what you have learned to other music you listen to... soon you'll start identifying jazz influences in hip hop and even everyday pop shyt you hear everywhere.