Grease is a semi-solid lubricant made of oil, thickener, and additives, acting as a barrier against contaminants and decay. It's easier to contain than oils, ideal for leak-sensitive areas. Grease suspends solids, guarding against abrasive wear, maintaining stability under pressure. Widely used across industries for prolonged equipment life, lower maintenance, and superior performance in harsh conditions, its versatility suits various mechanical applications.