need to learn about locus

[B3autifulVampir3]

i have no idea what is going on when we talk about locus can someone tell me what it is about and how to figure it out. that would help a ton thanks

 

[skeeter]

http://www.regentsprep.org/Regents/Math/locuspt/What.htm

 

[Denis]

i have no idea what is going on when we talk about locus .....

WHY? Your teacher did not explain?