Grease is a thick and oily substance usually used as a lubricant. As a true sample of grease, it must contain either oil and/or other lubricants usually mixed using a thickener, usually a soap so as to form a solid or semisolid substance.
Greases come in different types depending on the manufacturing and preparation processes. The two main ones that most people confuse are the dielectric grease and silicone grease with some interchanging each for the other. In light of this, you can read through and get the notable differences between them.