The choices available in track Send selectors include bus and output paths.
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Pro Tools provides 256 internal mix busses for routing signals internally. Internal bus paths are useful for submixing and processing with plug-ins. Bus paths are defined in the I/O Setup dialog, and are available in all supported channel formats (mono, stereo, or multichannel, as supported on your system).
Hardware sends are often used for headphone cue mixes, or for sending signals to external effects processors. Sends do not automatically return audio as do hardware inserts.