From Teflpedia

Manner (/mænə(r)/) is essentially the way something is done or happens. It can be a grammatical property.

In English, we describe manner using manner adverbials, which include single-word phrase manner adverbs. A manner adverbial can also be formed of prepositional phrase adverbials using a preposition of manner.

We use the wh- word "how" to ask questions about manner.