difference between Online transaction processing ( OLTP )and online Analytical processing (OLAP)

Difference between OLPT and OLAP system
OLTP	OLAP
Online Transaction Processing	Online Analytical Processing
We can see only current transaction, fresh data	relatively historical data
normalized	denormalized
detail level data available	summarized data available
type of media required to store the data is small	huge database / data warehouse required large media
data extraction : fast	slow