Many websites offer documents in a file format called PDF. This is an Adobe invented format short for portable document format.
A PDF file is designed to show information and pictures in the same consistent way across all electronic devices and computers.
For example, on this site you can download coloring pages as PDF documents. This file can be displayed on any computer and when printed will output the same way everytime. Pictures and text will not move around or change fonts.
Most computers and mobile devices will display a PDF document natively meaning you don’t need a special program to open them. The operating system, like Windows or the MacOS, have a built-in function to open and then print the PDF document.
Just find the PDF file on the computer and double click it to open it.
Adobe also makes a free PDF reader available if for some reason your computer won’t open a PDF file. You can download it here.