Sites is Google's free tool to create custom websites. Similar to a wiki, you can develop the site by yourself or choose to collaborate with others on the creation and content of the pages. Then, you can decide on the level of sharing you would like to permit. You can determine who the owners are, whom you would like to give permission to edit and revise the site, and whom you would like to give permission to view the site. You can limit viewing your site to a small, private group or you can choose to publish it so that it is accessible to anyone in the world.