We have implemented our software in SQL server 2008 r2 Standard DB. Client has bought Sql server 2014 standard. I believe r2 will work on 2014. But I am not aware whats the difference between them and whether our application will work smoothly with out any issues. Please Assist me on this.
Compatibility forward from 2008R2 to 2014 for most database behaviors will be fine. You can back up a 2008R2 database and restore it to 2014. However, there are differences. Looking at the What's new documentation can help. It really depends on what you're implementing for your clients. Probably the best thing to do would be to upgrade yourself so that you can properly support them.