What is UART and JTAG??

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Hey friends, i'm starting to work with microcontrollers, i'm absolute newbie, and I want to ask what does UART and JTAG means? Explain as simple as possible! Thank you so much!

UART = Universal Asyncronous Receiver/Transmitter

JTAG = Joint Test Action Group

UART is a type of chip that controls communications to and from a device, such as a microcontroller, ROM, RAM, etc. Most of the time, it's a serial connection that allows us to communication to a device.

JTAG is a set of test ports that is used for debugging but can also be used to program firmware (which is commonly done).