Ok, so here's how the tournament works, you begin with 64 teams:
1. In the regional round, those teams are broken up into 16 x 4-team regional rounds. There is a one seed (16 national seeds), 2, 3, and 4 seeds in each region. Those 4 teams play in a double elimination tournament until one team emerges. Starts with 1 vs 4 and 2 vs 3. Winners of those games move to the winners bracket and losers move to the losers bracket. Everyone plays until they have 2 losses, last team standing moves on.
2. In the super regional round, you now have 16 total teams, divided into two teams in each super region. If the top seeds held from the regionals (which they often don't), then this would be 1 vs 16, 2 vs 15, etc. This is simply a best of 3 series, first team to win 2 games is on to Omaha for the CWS, so 8 teams go on there. This is where we are now.
3. CWS: there are now 8 teams remaining, broken up into 2 brackets. This round is played essentially the same as #1 above, 4 team in each group, double elimination setup. Our group will be us, Florida State, Virginia, UNC. 1 team survives from each group, so 2 teams total.
4. CWS championship series: this is just a best 2 of 3 for the 2 remaining teams to determine the title.
Hope this helps! I really enjoy the organization of the tournament and that you're not booted with one loss at any point.