Blades are either "stick tang" or "full tang".

Stick tang is where the blade ends in a tang, that is fully enclosed by a handle material. 

Like in samurai swords or Scandinavian knives.

Stick tang knives usually have a bolster between the blade and the handle, make sure you get the right one for the blade.

Full tang is where the steel of the blade is visible all the way around the handle.

And the handle consists of 2 scales, one scale/plate is attached to each side of the blade.