By the gravitational collapse of massive stars - once they stop producing energy.
Black Holes.
No, black holes are not created daily. Black holes are formed from the remnants of massive stars that have undergone supernova explosions or from the collisions of other black holes. The rate at which new black holes are formed in the universe is relatively low.
Black Holes are regions of space where gravitational acceleration if so great , that not even light can escape from it. Since like cannot escape from it , but only go into it , it does not show any light, but appears as a Black Hole. Although light is an electro-magnetic wave, it exists as particles called PHOTONS. It is these photons that fall into Black Holes. Black Holes may be thought of as regions of gravitational whirlpools. Gravitational acceleration throughout the universe is NOT uniform. There are regions of very strong gravitational acceleration and other regions of very poor or no gravitational acceleration. This 'clash' of gravities creates gravitational whirlpools (Black Holes). Think of it like a stream of water going over a rock bed. There are points were the water does not move and points were the water moves quite violently, and this creates whirlpools in the stream. Gravity in the universe may do just the same.
The density of matter just after the big bang is calculated to be sufficient to have spontaneously created black holes; such are called primordial black holes, and searches for their existence are ongoing.
Even though black holes suck through parts of the universe, the universe is inevitably big, and growing so as the universe is being sucked into another dimension by black holes, it is also expanding.
There are already black holes within the universe
Black Holes' can 'eat' any type of matter in the Universe.
Probably stellar mass black holes
The universe likely contains millions upon millions of black holes.
No.
YES!!! How would we know they are there if we did not 'detect' them.
Black holes are found throughout the universe, typically at the centers of galaxies. They are created when massive stars collapse under their own gravity. Black holes have immense gravitational pull and can distort spacetime around them, making them fascinating objects for study in astrophysics.