On a Mac computer, screenshots are saved to the desktop by default. When you take a screenshot, whether it's the entire screen or just a portion of it, the image will be saved as a .png file on the desktop. The file will be named 'Screenshot' followed by the date and time it was taken. For example, 'Screenshot 2021-01-22 at 10.45.33 AM.png'To take a screenshot on a Mac, you can use a combination of keyboard shortcuts. To capture the entire screen, press Command + Shift + 3. To capture a selected portion of the screen, press Command + Shift + 4, then use your mouse or trackpad to select the area you want to capture. To capture a specific window, press Command + Shift + 4, then press the Spacebar, and then click on the window you want to capture.You can also use the built-in screenshot tool on Mac, called Grab. To use Grab, open it from the Applications > Utilities folder. From there, you can choose to take a screenshot of the entire screen, a selected window or a selected area. The screenshots taken using Grab will also be saved on the desktop.Once the screenshot is saved on the desktop, you can move or rename it as you wish. You can also open the screenshot in an image editing software like Preview or Photoshop to make any edits or adjustments before sharing or printing it.It's worth noting that some apps like browsers, have their own screenshot tools, and the screenshots taken on these apps might be saved on a different folder, so it's best to check the app settings or check the app's documentation to know where the screenshots are saved.In conclusion, on a Mac computer, screenshots are saved to the desktop by default, in the form of .png files, with the filename starting with 'Screenshot' followed by the date and time it was taken. You can take a screenshot using keyboard shortcuts, or the built-in screenshot tool on Mac, Grab. You can then move, rename, or edit the screenshot as desired, but be aware that some apps might save the screenshots on a different folder.