The term Bot in League of Legends refers to computer controlled opponent (AI - Artificial Intelligence) available in custom games and Co-op vs. AI matches. Bots can have either "beginner" or "intermediate" AI.
On January 24, 2012, it was announced that the bot system would be expanded with more bots, better intelligence and availability on the Crystal Scar. On February 1, 2012, the system was released.
On April 15, 2014, an update to the bot AI was released, primarily improving threat evaluation and the ability to dodge skillshots, as well as updating the item builds used.
Bots can be used for:
Practicing against or learning how to play a new Champion;
Filling in for missing players to even out teams;
Leisurely play for those who do not want to experience such competition between summoners;
New players who want to familiarize themselves with the game (champions, maps, items, item builds, champion skills, strategies etc.) before competing with other summoners.
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Intermediate bots take 15 mastery points and have 16 runes — five each of Tier 2 Marks/Seals/Glyphs and one Tier 2 Quintessence. Intermediate bots have no increased stats except for a boost to their passive gold gain.
Beginner bots have neither runes nor masteries.
On January 24, 2012 it was announced that new bots would be added to the existing pool. This was implemented on February 01, 2012.
Since this update are 53 of 140 (37.86%) champions available as bots.
Prior to V4.7, only 29 champion bots were available in custom games, and could only be at beginner difficulty. Custom games now allow all available bots at beginner or intermediate difficulty.
To add a bot into a practice game, you must first be the creator or the host of the game. Then, click the "Add Bot" button on the right of the empty slot to add a bot to the corresponding team. Once a bot has been added, you can then change the Champion of the bot by selecting it from the drop-down menu.
In the new tutorial, Battle Training, four new bots appeared, with a high AI, these are: ShenShen, who plays on the player's team, and Annie, MalphiteMalphite, and NasusNasus, who opposed the player.
During Sona's release in patch V18.104.22.168, she was unintentionally added onto the bot roster. Bots' names are usually made up of the champion name followed by the word "Bot" (e.g. Annie Bot). However, Sona went by the name "game_bot_sona". She did nothing but autoattack and she was removed from the bot roster with V22.214.171.124. She has been reintroduced as a standard bot with the Rise of the Bot Army update.
After the update, NasusNasus and Alistar appear to be scheduled for removal as bots. However, it is possible that they will still be able to be selected in custom games, but won't be available in random player vs AI games. They, together with MalphiteMalphite and Sivir, were unavailable in that mode before the update.