Microsoft Access is a database management system (DBMS) from Microsoft that combines the relational Microsoft Jet Database Engine with a graphical user interface and software-development tools. ... It can also import or link directly to data stored in other applications and databases. This application can use SQL Server Database as it's storage requirements
Microsoft SQL Server is a relational database management system, or RDBMS, that supports a wide variety of transaction processing, business intelligence and analytics applications in corporate IT environments. It's one of the three market-leading database technologies, along with Oracle Database and IBM's DB2. In many cases we use SQL Server Express to keep costs low since this is a free application.