Apexpages is a class and Addmessge and Add messages are two method to show message from class to page.
ApexPages.addMessage: Add a message to the current page context. Use ApexPages to add and check for messages associated with the current page, as well as to reference the current page. In addition, ApexPages is used as a namespace for the Pagerefernce and Message classes.
The package.xml file, also known as the project manifest, is a control file that determines the set of metadata components
to retrieve or deploy in a project. In practice, it is much easier to use the Project Properties dialog to add or remove components
from a project—which modifies package.xml for you—but it is also possible to edit package.xml by hand.It holds complete schema of your org (like custom object, standard object, custom fields etc etc..). You can get more info in this PDF and also you can get some more information over this here
ApexPages.addMessage: Add a message to the current page context. Use ApexPages to add and check for messages associated with the current page, as well as to reference the current page. In addition, ApexPages is used as a namespace for the Pagerefernce and Message classes.
The package.xml file, also known as the project manifest, is a control file that determines the set of metadata components
to retrieve or deploy in a project. In practice, it is much easier to use the Project Properties dialog to add or remove components
from a project—which modifies package.xml for you—but it is also possible to edit package.xml by hand.It holds complete schema of your org (like custom object, standard object, custom fields etc etc..). You can get more info in this PDF and also you can get some more information over this here
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