Why solar panels have a network of water pipe?

Solar panels may have a network of water pipes in solar thermal systems, where water is heated by sunlight and circulated for heating purposes, such as in residential heating or Swimming Pools. The pipes carry the heated water from the solar collectors to a storage tank or directly to the point of use. This system efficiently transfers thermal energy from the solar panels to where it's needed, optimizing energy use and reducing reliance on conventional heating sources.