Glossary
What is a TAF?
A coded forecast of the weather expected in the area immediately around an airport over a defined period ahead. It is a prediction rather than an observation, and it is issued only for airports that have forecasting service.
Also called Terminal aerodrome forecast
That is the whole entry for now. The longer version, with the mechanics and worked examples, is still to be written. See autorotation for how those read once they exist.