DSLR or MIRRORLESS CAMERAS?

I'm confused alott about the DSLR OR MIRRORLESS?
i want to purchase a good camera for general photography, as a hobby? So what to keep in mind while choosing a DSLR?
i want a DSLR IN BUDGET, with good Pixels and high optical zooming.
which brand i should go? NIKON or CANON?
What kind of lens i require?
what to keep in my mind while choosing a lens?
how can i distuingh bw a SLR OR DSLR?

They don't really make SLR anymore. That would be an actually film camera The DSLR Means Digital.

There's apparently things you don't understand here.

"in budget?" What does that mean? What is your budget. In dslr cameras good starts at about $600 and goes up.

"good pixels and high optical zooming"? The pixel count doesn't really matter. It's the sensor size and quality that makes the real difference along with the cameras internal data processing. Zoom? That's determined by what lenses you buy (can afford). Dslr cameras don't work like your typical small point and shoot that spout about 30X zoom… It doesn't work that way. I'd suggest some serious reading about dslr lenses so you can understand what I'm writing about here.

As already stated an SLR is a film camera, a DSLR is a digital camera.

If you're asking these questions, I'm guessing your best bet is a 3rd generation camera. These are sometimes referred to as "crossover" cameras as well.

These are the new line of cameras that don't use the 20th century technology of a mechanical mirror inside that flips up and down between photos. Keep in mind, these cameras can be expensive as well, like the Sony NEX-7 that goes for about $1,200.

But there are many other models in the $300 range that are very good. The Nikon P520 has a 42x optical zoom lens. I have the earlier model of this camera and it more than fulfills my needs. I have owned SLR cameras in the past (pre-digital), and the digital features on this camera coupled with that lens and fast exposure time make it far superior to the SLR's I owned.

I'm not particularity sold on Nikon. I know Nikon, Olympus, Canon, etc. All claim to be the "best" but I really don't notice any difference between the results of any brand within a price tier.

It it true that sales of DSLR as a percent of total camera sales has decreased in the last few years. And some camera enthusiasts even go so far as to say they will no longer be a viable camera for personal photographs. https://www.stuckincustoms.com/2012/01/04/dslrs-are-a-dying-breed-3rd-gen-cameras-are-the-future/

Oh, and just for the record, 35MM film SLR cameras ARE still in production, though they are few. Nikon sells the F7 for about $3,000 if you're interested.

SLR is a Film camera, Single Lens Reflex.
The image is viewed and taken through a single lens (distinguishing it from the Twin lens reflex), and is sent to the viewfinder by a mirror (reflex).

DSLR is a Digital version., putting the digital sensor where the film would have been - a true DSLR has an optical viewfinder that sees through the lens.

Mirrorless is a DSLR style camera (advanced controls, interchangeable lens), but instead of using a mirror to divert the image to an optical viewfinder, it uses an electronic viewfinder (EVF). Generally a smaller format, and not quite as large a sensor as a DSLR.

Dropping one level further, the "Bridge" camera (and many abuse that term) is a camera with advanced controls, but with an built-in zoom lens.

In DSLR and mirrorless, the zoom is determined by which lens you fit, and with interchangeable lenses, you can extend the range by having lenses that cover different ends of the range, just as a traditional SLR photographer would have carried extra lenses in their bag - a couple of zooms to cover the wide and tele, and maybe a prime (not zoom) lens with better aperture to cover low light conditions.

A good DSLR kit is not cheap!