The language of informal speech is called?

There isn't one specific name for the language of informal speech. However, you can use a few terms to describe it:

* Informal language: This is the most general term, and it encompasses a wide range of features.

* Colloquial language: This refers to everyday speech and is often regional or dialectal.

* Slang: This includes words and phrases that are specific to a particular group or subculture.

* Vernacular: This refers to the language of the common people in a particular region.

* Spoken language: This emphasizes that the language is used in oral communication, rather than written.

The specific term you use will depend on the context and the specific features of the informal speech you're discussing.