From Teflpedia

Manner (/mænə(r)/) is is a circumstance that expresses the way something is done or happens.

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. It can also be a manner clause

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

Manner is a homophone with "manor".