Just wondering.
This happens when bacteria gets into the urethra. The urethra is where urine is discharged from. Wiping from front to back, which you learn when you are young, and urinating within an hour after sex are great ways to prevent them. If you feel one coming on drink d-mannose and take vitamin c. UTI's cause a burning when you pee. You also have an urge to pee but only a trickle comes out. It is important to treat them because the infection can spread to your kidneys.
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Attention Ladies, this is Suzi, many people have been writing in asking what the stuff was that I used to clear up my UTI last week, so I wanted to put the link to this stuff here
It is called CT - DM 
When bacteria is entered through the urethra. Sometimes sex can cause it from the back and forth motion. Wiping back to front after you urinate can also be the cause. Also have a catheter in could be the case.
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Oprah
It is an infection if the urinary tract from the bladder. Using bubble baths have been linked to UTI's, also, wiping yourself from back to front after having a bowel movement. This brings bacteria that may also cause infections.
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TO add to the answer I just read you can also get it by not changing your underwear. You just need to keep clean. It doesnt seem pleseant. My sis had it.
Hope I could help
-Hamster
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This happens when bacteria gets into the urethra. The urethra is where urine is discharged from. Wiping from front to back, which you learn when you are young, and urinating within an hour after sex are great ways to prevent them. If you feel one coming on drink cranberry juice and take vitamin c. UTI's cause a burning when you pee. You also have an urge to pee but only a trickle comes out. It is important to treat them because the infection can spread to your kidneys.
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I agree with payton and your second answer
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It is a bacteria that is inside of you urethra. It causes burning when you urinate. And it also causes you to urinate a little and the urine is cloudy. It has a really bad Oder and it is usually cured with antibiotics. If it is not treated it can lead to a kidney infection. Which is very painful. An alternatives to treat UTI is cranberry juice, pomegranate juice, lots of water.
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i don’t want Junior to get a urinary track infection so i got him wet food too, thanks @SinceroThin! http://twitpic.com/2dx55q
a urinary track infection is not an std nick – and how u know that’s what it stands for? Lol
i’m pretty sure i have a urinary track infection (idk if i spelled that right) i have to pee every 2 mins! soooo annoying.):
Is there seriously a business called “UTI”?? Wtf did it ever occur to them that is sho for Urinary Track Infection?? Creepers