Flax seed is gotten from the flax plant from which a cotton like fibre is made to make linen products. From the same plant flax oil to is derived.
The flax seed is in a league of its own though. It’s another super seed. It’s best consumed ground to make it easy for digestion. Used well flax seed helps bowel movement thanks to its high fibre content.

Flax seeds can be used in baking too. It can be used in baking bread to the sees can be ground to to be mixed with other flour to bake. If consumed whole, flax seeds must, like all foods be chewed properly considering it has a hard shell.
These come enriched with fibre, protein, magnesium, calcium, phosphorous, lignan among other nutrients and minerals.