Your camera saves this information, which we call "metadata" (because it is data about the data captured in the photo itself — one level beyond, or meta), in every file. There are many utilities which can read and display this. I'm not aware of any software designed for photography which doesn't — that'd include Adobe Photoshop and Lightroom, Picassa, and any image viewer. You can also get stand-alone programs which can manipulate this metadata in various ways, including editing or removing it, or giving you different presentations (like, "find all the photographs I took with a certain lens").

But, in fact, almost all modern operating systems have a mechanism for showing this information built in. Just open the folder on your computer and then, when you see the list of files:

• In Microsoft Windows: right click on a file, choose Properties, and then look in the Details tab.

• In Mac OS X, right click — or command-i — and then click the triangle by More Info to expand.

• In GNOME, as in the Fedora Linux operating system, right click, choose Properties, and go to the Image tab.

Again, each of these operating systems — and not to mention Chromium, iOS, or Android — will have more advanced utilities. But you can see the basic information right there without anything extra.