Definition of structure
What we mean by structure is the way a tournament is constructed. When you enter a tournament, you wonder what the structure is going to be, in other words, how the blinds are going to move. Some structures are hyper-turbos. In a hyper-turbos structure, the starting stack is small (500) and the blinds structure moves very quickly. Blinds often start at 25/50 and increase every 3 minutes. Other structures are much slower with much larger starting stacks. These structures are often called "deepstack".
What impact does the structure have on the tournament?
Each structure has its advantages and disadvantages. The faster the structure, the more variance you will have in that structure. On the other hand, you can play it more frequently and invest less time. It is true that a deepstack tournament will give us better results in the long run, but a deepstack tournament can be played over 2 days with 10 hours of play per day. If you just want to play a tournament on a small night for fun, you will probably choose a faster structure.