To "synchronize" means to cause two or more things to happen at the same time or to operate in harmony. This term is often used in technology, such as when devices like smartphones and computers share data, ensuring that the information is the same across all platforms. In everyday life, synchronization can be seen in activities like coordinating schedules for meetings or events. For example, when people use calendars to find a common time to meet, they are synchronizing their availability to ensure everyone can attend.