Access Services in SharePoint Server 2013 allows people to host Access databases in SharePoint within the context of an Access app. Access apps for SharePoint are new in SharePoint Server 2013 and you will build them using the Access 2013 desktop client. You can create, edit, and update linked Access 2013 databases and then view them directly from the app. You can also use Access Services to view and edit a web database that was created using Access 2010 and SharePoint 2010, and you can republish them to SharePoint Server 2013. You can't create a web database using Access Services in SharePoint 2013, but you can import Access 2010 web databases into an Access app. Access apps are SharePoint apps, therefore fo Access Services to run Access app, SharePoint Server 2013 needs to be configured as a SharePoint app server. In addition, Access Services requires SQL Server 2012 to run.
Each Access app creates its own database on SQL Server. In SharePoint Server 2013, SQL Server 2012 is the only version of SQL Server that can serve as the SharePoint Server 2013 application database server for Access Services. . For installing SQL Server 2012, refer to the article Installation for SQL Server 2012 .