EVE PLEX can be traded between players on the in game market. It can also be used in the New Eden Store to upgrade your account to Omega Clone state, purchase virtual goods, and activate other account services.
110 PLEX is valued at $0.0453 Cents each. This is the highest cost of all packages and is intended for if you just need a few more or want to try your hand at selling PLEX for ISK for the first time. 110 is not enough to give you Omega status in game. Omega is 500 PLEX for 30 days.
To use PLEX in the New Eden Store, It must be placed in your PLEX Vault. The Vault is a secure location in your inventory, shared across all characters on your account, where it can be placed for use in the New Eden Store. You can find the Vault in your inventory in the Neocom (Upper left corner of your game screen).