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 various types of concrete sealers, including acrylic, epoxy, and silicone sealers, each offering different levels of protection and aesthetic appeal. Choosing the right sealer depends on the specific needs of the project, such as exposure to weather, foot traffic, and desired finish.