The Page layout determines the key components of page design and the organizational structure of a webpage. Containers act as placeholders on websites. Blocks are the UI elements contained within containers. By choosing the relevant containers and blocks from an XML file, Magento web pages are built.  Each page in your business has a certain layout made up of sections or containers that designate the header, footer, and content areas. Each page's layout will determine whether it has one, two, three, or more columns. It can be viewed as a floor plan for a page