Does anyone know what kind of bike this is?
That's not a great photo, but I see:
- 26 inch wheels
- No front derailleur mech - (its a 1x from before that was cool?)
- Old school front suspension forks with boots over the stanchions
- V Brakes
- Interesting in-line rear shock absorber - I can't see any details of how the rear suspension hinges... there's a high chance its by the Bottom Bracket or a small possibility its all in the flex of the frame which is terrifying.
Upshot - its some low-end BSO from the early 2000s. Main intended use is "comfort" flat street riding, with no big jumps or drops. The rear suspension probably doesn't move much if at all. Earlier bikes would have had a triple chainset because when it comes to gears, more is better for sales. The single chainring is a cost saving.
If you want a specific brand, then that rear shock is the most distinctive feature, so start googling about for "mtb frames with rear shock in seat stay" and start digging.
Also have a very close look at the head tube and sides of the downtube looking for logos and words, or traces. You might get lucky and find a name.
In reality, brand matters not-at-all. It will use common 26" wheels and parts, there's no need to match brands.