I got this bike more than 5 years ago and I don't remember its model. Every clue/reply to this post will help!
It's a fairly low-end bike with 26 or perhaps 24 inch wheels. The V brakes suggest that it is at least 5 years old and could be up to 20 years though I'd guess 10-15 based on the lack of boots on the front suspension stanchions.
The front shifter appears to be a thumb lever on a triple crankset, which also suggests a price-conscious design. 18/3 is 6 speed on the rear, which could be a cassette but is more likely to be a 14:28 freewheel.
There is very little space between the seat-tube and the rear triangle, so this bike could hit its own frame on any harder landing. The rider must be a kid or very small adult to reduce this risk.
And it has a kickstand, a common sign of a kid's bike. Nobody riding MTB would have something like that which could deploy on a landing and cause a problem.
It looks like a perfectly rideable bike, albeit for a smaller/younger person. Absolutely fine for riding paths and trails, though probably not suitable for anything aggressive or stunts or big drops.