What is a black hole?how can something have infinite density and time freezed?

How does it attract light towards it self and what happens when something get into a black hole?

its the gravitational force that pulls everything towards it!!! and your other question what happens when it enters... i reallly don think anyone has an answer to that.. coz no one has returned back from a black hole..

not quite true. things do escape from black holes, and its actually a fairly common occurence. Hubble takes pics of it all the time. There are particle jets that are emitted perpendicular from a black hole, and this consists of a super-heated mixture of gases (vapors technically) that theoretically shouldn't be gas because it is hot enough to become plasma. also, not all stars, not even 5% of all the stars, have the potential to become a black hole. only the largest classification of stars can become black holes. basically, super-super-supergiant star runs out of hydrogen to burn, and starts burning the next-lightest element, helium. then after a stream of this, other elements burn, it super-heats, the outter shells explode off, the super-dense core attracts everything that blew off back to it, it compresses, etc. etc. all of this=black hole. still just a dense mass. not infinite, just too large for us to understand.