Yellow

Yellow tea is a Chinese style distinguished from green by a post-fix step called men huan (sealed yellowing), in which the still-warm, lightly damp leaf is covered and allowed to transform slowly over hours or days. This mellow step drives off some of the harsh grassy volatiles in green tea, producing a smooth, clean, and distinctly mellow liquor that does not taste like green and does not taste like anything else. Genuine production is small and concentrated in a few regions: Junshan island for Silver Needle, Meng Ding mountain in Sichuan, Huo Shan in Anhui. Much of what is sold as yellow tea either skips the yellowing step entirely or does it imprecisely, making sourcing from verified producers the central purchasing challenge.

teabert, the tealytics teapot, keeper of the kettle
Yellow tea is green tea given an extra slow, sealed rest that leaves it softer and rounder, and a lot of what carries the name skipped that step, so buy from someone you trust. It is the rarest of the classic tea types, made in such small amounts that most tea drinkers have spent more time reading about it than drinking it.
How it's made

The steps overlap in practice; this is a reading order, not a set of separate stages.