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Worm holes are still fictional and theoretical.
A worm hole is a tube made of spacetime that
connects two different regions; you could enter
one side of the tube and exit the other end
somewhere else, or even somewhen else
(time-traveling). A worm hole would be tears in
two locations of our universe with a “tunnel”
between them, if the worm hole was large enough,
you would be able to go from one end to the other
through the tunnel, bypassing all the distance in
Black holes are the result of massive stars
collapsing in on themselves and basically falling
out of our universe. They compress to such a tiny
area called a singularity. A black hole is a point
of no return, its gravity is so strong that once
you get past a certain point (called the event
horizon) there is no turning back. Not even light
can exit the event horizon. Black holes were
originally theoretical items, but now astronomers
are fairly certain and they have identified
several in reality.
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