M42 is an “emission nebula,” a patch of brightly glowing gas in deep space. M42 is easy to find with binoculars or a small telescope, lying along the “sword” of Orion, a long string of stars extending under the left side of the famous “belt.”
If you don’t have a telescope, you can visit a local planetarium or astronomy club to get a view. Just don’t expect to see a colorful, swirling “Hubble photo”! Such nebulae are very distant and inherently not very bright. So expect to see a faint, grey fuzzy patch.
Even so, M42 is one of the brightest and most visually-interesting of all the so-called “deep sky” objects. And it will only be in the sky for another month! So catch it while you can!