The official automation feature: your character fights, loots, uses potions and sits to recover on its own, within limits you set. It earns less than playing by hand and is the only sanctioned way to automate. Details, with every figure read from the live server: Assist Mode in the wiki.

Yes. It fights, loots, uses healing potions and sits to recover. Paid tiers add skill slots, the monster filter and a better rate. What each tier gets is in the wiki article.

No. Third-party bots, macro software, packet tools and modified clients are blocked at the client level and are grounds for removal. Rules & Policies.