Fat tissue, also known as adipose tissue, is a specialized type of connective tissue that primarily functions in energy storage and insulation. It consists of various types of cells, including adipocytes (fat cells), preadipocytes (precursor cells to fat cells) and stromal vascular cells (which provide support for the other cell types). Fat tissue can be found throughout the body, with the largest deposits occurring in subcutaneous areas such as the abdomen, hips, thighs, and buttocks. It plays a crucial role in maintaining energy balance by releasing stored fatty acids into the bloodstream when needed for fuel or during periods of fasting. Additionally, it serves as an endocrine organ, producing hormones such as leptin (which regulates appetite and energy expenditure) and adiponectin (which has anti-inflammatory properties).