It has no solid surface. Its size is about 100 times that of the Earth and its mass is roughly 300,000 times that of the Earth. The Sun is composed mainly of hydrogen and some helium. The Sun is often referred to as a garden variety star. This means that it's rather average.
Some stars are bigger, more massive, and brighter.
Others are smaller, less massive, and less bright. Some stars are single like the Sun. Others have one or several companion stars. Some stars are much older than the Sun. Others have been formed very recently.