Chemotaxis is the movement of leucocytes (white blood cells) towards the site of injury or infection in response to specific chemical signals. This process is crucial for the immune system to target and eliminate pathogens or damaged cells. Chemical signals, often called chemoattractants, are released from the site of injury or infection. These signals create a gradient that leucocytes follow, moving from areas of lower concentration to higher concentration of the chemoattractant. This mechanism ensures that immune cells are efficiently directed to areas where they are needed most, allowing for a rapid and targeted immune response.

**_ Phagocytosis is the process by which certain cells, such as macrophages and neutrophils, engulf and digest microorganisms, cellular debris, and other particles. While phagocytosis is an important immune response, it is not the same as chemotaxis, which specifically refers to the movement of cells towards a chemical signal. Apoptosis is a form of programmed cell death that occurs in multicellular organisms. It is a controlled process that allows the body to eliminate damaged or unnecessary cells. Apoptosis is distinct from chemotaxis as it involves cell death rather than cell movement. Steatosis, also known as fatty change, is the abnormal retention of lipids within a cell. It is commonly associated with conditions such as fatty liver disease. Steatosis does not involve the movement of cells and is unrelated to the immune response mechanisms like chemotaxis. Chemotaxis is a critical process in the immune response, allowing leucocytes to move towards the site of injury or infection along a chemical gradient. This targeted movement ensures that immune cells can efficiently address and resolve pathogenic threats or tissue damage.