The Sun is the center of our Solar System, about which the Earth and other planets revolve. But the Sun is also a very average star, like billions of others in our galaxy, the Milky Way. The Milky Way is an average spiral galaxy, one of the largest in our Local Group of galaxies, but not particuliarly large when all types of galaxies are taken into account.
Several nice tours of the Sun are available:
Since these links take you into cyberspace, to return to these pages use either the back button at the botton of the Mosaic window or bring up your window history file by hitting an h while the cursor is in the Mosaic window and use the scrollbar to move through the places you have been to find the page you last visited here, double click on that entry and you will return!