Why metal conduct electricity rather than a wood?THANK YOU!

In metals, part of the electrons can freely move through the crystal structure. Electrical current is a flow of electrons, and only those "freely moving electrons" can flow of course. Metals are therefore called "conductors".
In wood, all electrons are tightly bound to the molecules, there are no free electrons that can move around, hence no electron flow or electrical current.
Wood is therefore called an "insulator".