Google is your friend, my friend. WAV, AIFF, FLAC, and ALAC are all lossless.
WAV and AIFF are very similar. They are both containers for RAW PCM audio. WAV was originally a Microsoft/IBM standard and AIFF was originally an Apple standard. They both preserve the PCM audio from CDs perfectly.
FLAC and ALAC are also very similar, with ALAC being Apple's lossless format. As lossless codecs, they preserve the PCM perfectly just as WAV and AIFF do, but they also...