Why do different materials have different resistivity?

Electric current is the directed movement of charged particles.
In metals, ions are arranged in a certain order, form a crystal lattice. As the electrons move, they meet with the nodes of the crystal lattice and hit them. Carriers of electric current on their way encounter a certain resistance to movement.
In each substance, the structure of the crystal lattice is different (location and frequency of nodes), the resistance to electric current will also be different. For different substances, charged particles on their way meet a different number of ions. There is a different number of collisions of electrons with the sites of the crystal lattice, so the resistance of different substances is different.