Definition of Full Ring
A full ring table is a poker table with 9 or 10 players. There are head-to-head tables with 2 players, shorthanded (SH) tables with 4-5 or 6 players and full ring (FR) tables, which generally have 9 players (between 8 and 10 depending on the cardroom). Shorthanded tables are generally contrasted with full ring tables. Each table will have its own style of play. In general, tournaments are more popular in full ring and cash games are more popular in shorthanded.
Are you more of a shorthanded or full ring style?
Each table is different. At SH tables, there's more action, the players are more aggressive, the blinds come back more often and there's more variance. In full ring, the blinds come back less often, the players are more conservative and the hand that wins the jackpot will always be a little stronger than in SH. There are also probably fewer bluffs in full ring than in SH. The variance is also a little lower in full ring. On the other hand, the profit per hour is greater on a SH table since you'll be playing more hands per hour.
