It's what's commonly known on here as s BSO, s bicycle shaped object. Meaning it look like s mountain bike or whatever but it's been made down to the cheapest common denominator so it can be sold in mail catalogues and the like for a low low price. Components will be non branded usually and it will be heavy.Yours look like a steel frame. No support from the seller if something goes wrong or fails.
It's natural habitat is the local cut or recycling centre where frustrated owners dump them.
Sorry, but it's not going to be much fun to ride or maintain.