Both OLAP and OLTP are data bases.Based up on type of data stored in database they classified in to OLAP and OLTP.
OLAP : Here only Current and detailed data is present . EX like ATM Machines , Reservation counters , call centers ETC... ( Data will present only for specific period.)
OLTP: Here we have summarized and historical data that means all the detailed data will get summarized and placed in OLTP. means information from the day one of the company Ex: from 1920 to present. OLTP is aslo called as data ware house.
I think iam correct please let me know if iam wrong