Tissues are groups of similar cells that work together to perform a specific function in the body. There are four main types of tissues: epithelial, connective, muscle, and nervous. Each type has unique characteristics and roles, such as protecting organs, supporting structures, enabling movement, and transmitting signals. In our bodies, tissues combine to form organs, like the heart or lungs. For example, the heart is made up of muscle tissue that helps it pump blood, while connective tissue supports and connects different parts. Understanding tissues is essential for studying how our bodies function and heal.