I looked at my response and it didn't look good.
Most tournaments have 3, 4 or 5 rounds. There can be multiple sessions within a round. As far as I know all tournaments are elimination tournaments, otherwise it would be just a one round tournament
Advancing from one round to the next is normally determined by table winner(s) format where either the 1st, 2nd or 3rd (number advancing varies by tournament or round) highest chip total at the table advance to the next round. Overall this is probably the most common format.
Accumulation tournaments advance people from one round to the next based on the X number(depends on the tournament) of highest chip totals across the field. The chip accumulation will continue for subsequent rounds after the X is determined. In other words, the Xs chips will be their starting chip totals for the next round.
A hybrid is some combination of the two above. It does not fit either of the above situations.
You might have a tournament where the top 36 chip totals after round one advance to round 2. Then beginning with round 2 the chip totals revert to everyone having have the same amount of starting chips and only the table winner advances. This would be a hybrid format.
Technically, I guess you could consider a tournament where the 2nd round will have (as an example) 48 people which would consist of 40 table winners and 8 wild card draws (or maybe the top 8 chip totals that did not win a table) to complete the field as a hybrid tournament.