When you first start Google Earth, the Places panel contains an empty My Places folder to hold places that you want to save. (If you are upgrading from a previous version of Google Earth, Google Earth imports your saved places.) Every item located in the My Places folder is saved for subsequent Google Earth sessions. Items located in the Places panel but not saved in the My Places folder are located in the Temporary Places folder and are unavailable in the next Google Earth session if you do not move or save them to your My Places folder.
You can use the Places panel to save and organize places that you visit, address or listing searches, natural features, and more.