- OLAP – OnLine Analytical Processing
- ROLAP – Relational OnLine Analytical Processing
- MOLAP – Multidimensional OnLine Analytical Processing
- HOLAP – Hybrid OnLine Analytical Processing
- DOLAP – Desktop/Database OnLine Analytical Processing
- WOLAP – Web Enabled OnLine Analytical Processing
Read more here – https://social.technet.microsoft.com/wiki/contents/articles/19898.differences-between-olap-rolap-molap-and-holap.aspx