A timestamp is a record that shows the exact date and time when something happened or was created. When you take a photo with your phone, it automatically adds a timestamp showing when you clicked the button, maybe “October 15, 2024, 3:47 PM.” When you save a document on your computer, the file gets a timestamp marking when you last changed it.

Timestamps matter because they create a permanent record of when things occurred. If two students accidentally save different versions of a group project, the timestamps show which version is newer. In a text message conversation, timestamps tell you whether your friend replied immediately or three hours later. Scientists use timestamps to track exactly when they recorded measurements during experiments. Security cameras use timestamps to show what happened and when.

Just as a postmark on a letter shows when it was mailed, a timestamp marks the moment something was created, sent, or modified. Digital systems rely on timestamps constantly: every email, every bank transaction, every website visit gets stamped with its precise moment in time, creating an invisible record of what happened when.