How to use the Zoom Tool? Zoomin and zoomout an image using Adobe Photoshop.
Explanation
The "Zoom Tool" allows you to Zoomin or Zoomout the image. I.e., to enlarge or decrease the text or image size.
Click on the magnifying glass icon in the toolbar and the mouse pointer will change to a magnifying glass.
The magnifying glass with the plus '+' sign enlarges the size of the image.
The magnifying glass with the minus '-' sign reduces the size.
To maximize only a particular portion of the image, Select the "Zoom Tool", drag it over the portion or simply press "Alt + Left Mouse Button" to zoomin or zoomout that portion of the image.
If you click without any selection, the entire portion of the file will be zoomed in or out.