Conductors
In conductor, electric current can flow freely. Metals such as copper, gold, silver and aluminum are great conductors. Mostly copper is used in household appliances and wiring of electric systems within your walls. The word "conductor" implies that the outer electrons of the atoms are held loosely and free to run through the material. Simply most metals are great conductors while most non metals are not conductors, just as most conductors conduct heat and insulators resist heat.
Insulators
Most Solid non metal materials are insulators because they restrict the flow of electric current. While conductors allow outer electrons to flow freely, insulators have great resistance and don't allow current to flow through. some examples of insulators are wood, plastic, rubber, glass, paper and pure water.
Below is a link to a video about conductors and insulators
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