In this context, lossless just means "the same quality as it was originally recorded in, which is sufficiently high for all practical purposes". And since our h

In this context, lossless just means "the same quality as it was originally recorded in, which is sufficiently high for all practical purposes". And since our hearing only goes up to 20kHz, if you record at a sample rate of 44.1kHz -- just above the Nyquist frequency -- you'll be able to faithfully reproduce the original audio to within the precision afforded by your bit depth (generally 16 or 24 bit). Sort of like how a RAW image is considered lossless because it contains every single pixel captured, even though it can only represent finitely many distinct colors and cannot zoom in infinitely far with no degradation.