Please explain Geodesics to me

I need to know Geodesics could you please tell me what it is in one sentence?

One sentence, comin' right up:

"Geodesics is a topic that anyone can find on Google."

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　　　　　　　　　 （　´∀｀）　＜　IF U WERE KILLED TOMORROW IN A TABLE-RELATED ACCIDENT, I WOULDNT
　　　　　　　　／　　　　|　　　 |　GIVE A RATS ASS BECAUSE I WOULD BE SITTING ON MY TABLE!!redcream look at this please
Michio Kaku On Aliens, On Physics ...
http://youtube.com/watch?v=uWW6_LfiJJk
http://youtube.com/watch?v=PW8rgKLPHMg
　　　　　　　/ 　　　 　 .|　　　　＼＿＿＿＿＿＿＿＿
　　　　　　 / "⌒ヽ |.ｲ |
　　　＿＿ |　　　.ノ | || |＿＿
　 .　　　 ノく＿＿つ∪∪　　 ＼
　　　＿（（＿＿＿＿＿＿＿＿_＼
　　 ￣￣ヽつ￣￣￣￣￣￣ | |￣

Maybe I can figure it out from the word parts.  Let's see, geo... earth, desic... dry?  Uh it be about dry earth, maybe those crack patterns you see when mud puddles dry up

A geodesic is basically a straight line.