Crop Tool

The Crop tool allows you to select an area of an image and discard everything outside this area.
The tool is located third from the top in the Photoshop Toolbox, on the left side.
Although cropping reduces the dimensions of an image, it is not the same as resizing.
Whereas resizing reduces or enlarges the entire image and everything in it, cropping does
not alter the size of the image content at all.