Hi doctors, can you tell me what is local anesthesia and general anesthesia?

Local vs. general: Local involves the "part" and general means the whole body is sedated, somewhat.

Dental as example: Local is commonly topical or local field injection with "novacaine orlidocaine" related drugs. General anesthesia is with intravenous and or inhalation agents that put the person totally asleep.

General = brain: Local anesthesia involves injecting numbing medication such as Lidocaine into the area to be numbed. The medication baths the nerves and blocks their ability to sense pain. An example is numbing the skin to suture a cut. General anesthesia uses medications that temporarily affects the brain putting you "to sleep" so you don't feel pain or have awareness. (it isn't really sleep).