A black hole is a region of space that has so much mass concentrated in it that there is no way for a nearby object to escape its gravitational pull. Even light cannot escape its pull.

This is a point in space where the ability for matter to support itself against gravity has been overcome (degeneracy pressure has been beaten by the force of gravity). At this point the pull of gravity is so strong that there is a radius at which nothing can escape not even light (this is a black sphere called an event horizon). I should note that mass (like dust, planets, gas etc) can't escape from the pull of a black hole for quite a distance outside this event horizon. Inside this event horizon the laws of physics as they are currently understood no longer hold true. That is to say that what happens inside this cannot be described in physics. The interesting thing is that black holes can "evaporate", that is lose mass (it's to do with particles being able to appear in and out of nothing at will). This mass loss decreases the larger the black hole is. So very small black holes disappear very quickly, where as for a super massive black hole to evaporate, would take a great deal longer than the current age of the Universe.

ive heard that some form of gamma radiation can escape a black hole also when somthing gets sucked in its called spegghitification(i dont think thats spelt right)the thing actully turns into a strand of speggheti because more gravity is pulling on 1 half than the other.

The concept of a "black hole" is still in debate with one of the newest theories stating that matter itself may simply disappear (per Dr. Stephen Hawkins.) Although his suggestion that matter can simply disappear was immediately rejected by most physicists, the mathmatics of his theory actually hold true!

A black hole is something that has so much mass, that it's gravity is so great that at a certain point (called the even horizon) NOTHING can escape it. It's not as a giant planet, or star - it's like a grain of sand weighing a 100 quadrillion pounds, or the mass of a large star shrunken into one point the size of a grain of sand. That object will pull in everything, and all of that matter (and energy) simply adds to the black hole's mass. The reason it is called a black hole, and not "super gravitational singular mass dot thing" is because, firstly, you cannot see it. It is black - there is no light, because all nearby light is being sucked into it. If you were to look directly at one, you would see no starlight - just a black, empty spot in space. The reason it's a "hole" is because everything falls into it. Einstein's explaination of gravity is that everything rests on the "fabric" of space and time. If you were to take a large peice of fabric (such as a bedsheet), tape the edges to the walls (so that on top and underneath is air), and then place a bowling ball on it, the bowling ball will create a large dent on the sheet. Throw some marbles into the mix, and they will roll along the sheet, until they fall into the dent the black hole created. A black hole would be, literally, almost a hole in the sheet. Anything falls into it cannot come back. It fell through. And if you imagine this on a 3D scale, you end up with a hole in space that things can fall into. This is also the reason that some people believe that falling into a black hole will transport you somewhere else in the universe (or another universe). After you fall into it, where do you go? If a marble falls through the bedsheet, it gets to the other side. What's the other side of space?