A file with the extension .TTA is a TTA lossless audio codec file. A TTA lossless audio codec is a free real-time loss-less audio compressor.

The term 'lossless' refers the fact that no loss of data quality occurs during compression. This means that when the data is uncompressed it will be identical to the original uncompressed data.

A TTA audio file is one long audio file i.e an audio CD in TTA format is not broken down into tracks but plays as one long stream.