In magento layouts are used to display contents of each page using layout.xml which we will found in app/design/frontend//default/layout. Each module have it's own layout file e.g. customer module has customer.xml and catalog module have catalog.xml etc. If we check these files , we will see different tags which contains different blocks. These layout files contains structural block and content block which decides which contain to be displayed on page. Sometime we need to update those block with our custom blocks so here I am explaining how we can do that:-

- For full code, Read the complete Blog: Customizing Magento Layouts with XML
 
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