Lomo and Polaroid are both brands with products in the photography field -- Polaroid are known for their instant cameras, with the name becoming synonymous for a camera that produces photographs instantly. Lomo are a Russian company that have also made cameras, but have become more well known recently following marketing by Lomography who have sole rights for distribution of their cameras outside Russia; their cameras are typically 35mm film cameras, and tend to be fairly low-tech (so no options like auto-focus, or wind on) but are sometimes specialised in a single way (for example, there is a fisheye camera).

Fujifilm is another brand, so that Fujifilm Instax 210 is neither a lomo or a polaroid - it just shares attributes that made those brands popular (i.e. specialised for a single purpose, and providing instant prints)