Drylined board / Plasterboard all the same thing.
2 ways of finishing it.
Tapered edge (The edges are indented really) - Butt the baords together, leaving a wide dip where the 2 tapered edges meet. Use joint tape (Ames Tape) like a webbed tape over the joint first. Then use filler over the top, and in the screw / nail holes where you've fixed the board to the timber / metal studwork behind.
Sand it back so it's all smooth, then apply a watered down emulsion coat first before painting