Concrete sealers are protective coatings applied to concrete surfaces to enhance durability and longevity. They help prevent water, oil, and other substances from penetrating the concrete, which can lead to damage over time. Sealers can also improve the appearance of concrete by adding a glossy finish or enhancing color. There are different types of concrete sealers, including acrylic, epoxy, and polyurethane sealers, each offering unique benefits. Choosing the right sealer depends on the specific application, such as indoor or outdoor use, and the desired level of protection. Regular maintenance of sealed concrete can extend its lifespan significantly.