You can glue laminate flooring, but it is not common.
The majority of the laminate flooring products on the market today do not require glue. The only way to know if the flooring you considering requires glue is to read the product description. Look for terms like “locking system” in lieu of glue.
Locking system laminate floors free float on top of the floor. They do not require glue; instead, the boards snap together and the open edges are hidden by molding. Since the project is not glued together, if you have problems, you can simply take the floor apart and reassemble it.
A locking system floor can be walked on immediately. A laminate floor that is glued together must cure. This means you cannot walk on the floor until the glue has had a chance to fully dry, which makes in inconvenient in high traffic areas of the home during the drying time. Another advantage to a locking system floor is if a board gets damaged later, the board can more easily be replaced than with a glued floor. Simply take the floor apart up to the point of the damaged board, replace the board and reassemble. With a glued floor, the board can be cut out, but fitting a new board in may require some tricky cuts and the floor may never be truly flat again.
Floors that are laid using a locking system are made to fit together with very minimal gap. That means any moisture that gets on the floor has very little chance to soak into cracks and damage the floor.
“Flooring, Ceiling and Cabinet Products by Armstrong.” Flooring, Ceiling and Cabinet Products by Armstrong. N.p., n.d. Web. 10 Nov. 2011. <http://www.armstrong.com>.
“Chicago Floors by Great Western Flooring.” Chicago Floors by Great Western Flooring. N.p., n.d. Web. 10 Nov. 2011. <http://www.greatwesternflooring.com>.