• AAC stands for Advanced Audio Coding. It's a type of audio compression algorithm used for audio encoding. AAC provides better sound quality than MP3 at similar bit rates.
• 5.1 typically refers to the audio channels included. In a 5.1 surround sound system, there are five full frequency channels (left, center, right, left rear, right rear) and one low-frequency effects (subwoofer) channel. This provides immersive audio.

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