Syncing refers to the process of bringing two or more devices, systems, or files into alignment. This can involve updating data on one device based on changes made on another device or system, so that they are in sync with each other. For example, when two calendars are synced, any event added to one calendar will automatically appear on the other calendar as well. Syncing is commonly used for sharing and managing information across multiple devices, such as computers, smartphones, or tablets.