Sealing pavers and concrete protects them from damage and enhances their appearance. Sealing creates a barrier between the surface and the elements, which can help prevent:

Weather damage: Fading, cracking, and discoloration caused by sun, humidity, and high water tables
Florida Temperature Change Cycles: Damage caused by extreme weather in Florida where the surface goes from extremely high temperatures to a sudden drop in temperature with afternoon showers. 
Stains: Concrete pavers are porous and can absorb stains without sealing
Weed growth: Between joints in the pavers
Pests: Entering through small gaps in the paver.

Sealing can also make your surfaces easier to clean and maintain. Sealed pavers can be cleaned with soap and water and a medium-stiff bristled broom. Some sealers can also enhance the pavers’ color and texture, and you can choose a glossy or matte finish.