It is the full game. You can redeem it via steam by following the instructions on https://support.steampowered.com/kb_article.php?ref=5414-TFBN-1352. You will need to register on steam (via https://store.steampowered.com/join/?) and download steam (on http://store.steampowered.com/about/) inorder to redeem the game.
You will be able to play the game offline by following the instructions on (https://support.steampowered.com/kb_article.php?ref=3160-AGCB-2555).