I am trying to follow this Simplicity proposal and I am seeing all over references to ‘jets’, but I haven’t been able to find any good reference to it.

Can anyone give me a brief explanation and or a link pointing to this feature?

On 31 Oct 2017, at 22:01, bitcoin-dev-request@lists.linuxfoundation.org wrote:

The plan is that discounted jets will be explicitly labeled as jets in the
commitment. If you can provide a Merkle path from the root to a node that
is an explicit jet, but that jet isn't among the finite number of known
discounted jets,