What is to send out light?

To send out light means to emit or radiate light energy from a source. This can occur through various processes, such as incandescence, where an object glows due to heat, or luminescence, where light is produced through chemical reactions or other means. Common examples include light bulbs, stars, and bioluminescent organisms. Essentially, it involves the release of photons, which are particles of light, into the surrounding environment.