The Lightning :navigation component uses a special type of JavaScript object named pageReference to navigate to other Lightning Components or standard views and standard object pages. The Lightning Component must implement a special interface named Lightning :isUrlAddressable to allow itself to be navigated from other components.
A pageReference object structure is shown in the following code snippet. (Note that it is comprised of a type (string type), attributes (object), and state (object). Let's take a look at it:
var pageReference = { type: 'standard__objectPage', //standard__component,standard__knowledgeArticlePage,standard__namedPage,standard__navItemPage,standard__objectPage,standard__recordPage,standard__recordRelationshipPage ...
