GNWL (General Waiting List)
Confirmation for GNWL ticket is on highest priority. You may get a GNWL quota, if you are starting your journey from a station close to source station and ending your journey at a station close to destination station.
CKWL (Tatkal Waiting List)
If you are booking your ticket under tatkal quota, you get CKWL status when tickets are unreserved. It is important to note that GNWL tickets will confirm first and then CKWL.Hence Confirmation Chances are less.
Indian Railways has defined some other W/L quotas in long journey trains like RLWL (Remote Location Waiting List), RQWL (Request Waiting List), PQWL (Pooled Quota Waiting List), RLGN (Remote Location General Waiting List) and RSWL (Roadside Station Waiting List). Confirmation chances for these types of waitlist tickets are very less.