Difference between Italic Language and Vulgar Latin

ITALIC LANGUAGE vs VULGAR LATIN: NOUN

A branch of the Indo-European languages of which Latin is the chief representative

Nonclassical Latin dialects spoken in the Roman Empire; source of Romance languages

Old latin, Hellenic language, Baltic language, Medieval latin, Italicism, Old italian, Low latin, Late latin, Landsmal, Old church slavonic, Vulgar latin, Dead language, Classical latin, Faliscan, Italic

Latino sine flexione, Italic language, Faliscan, Old italian, Biblical latin, Latin, Latinism, Latinly, Middle latin, Old latin, New latin, Late latin, Classical latin, Medieval latin, Low latin

Old latin, Hellenic language, Baltic language, Medieval latin, Italicism, Old italian, Low latin, Late latin, Landsmal, Old church slavonic, Vulgar latin, Dead language, Classical latin, Faliscan, Italic

Latino sine flexione, Italic language, Faliscan, Old italian, Biblical latin, Latin, Latinism, Latinly, Middle latin, Old latin, New latin, Late latin, Classical latin, Medieval latin, Low latin

As mentioned above, French is a descendant of the Vulgar Latin spoken by the common people of the Roman Empire.
Catalan is descended from Occitan, which is from Southern France, itself based on Vulgar Latin.
How, why and when did Vulgar Latin emerge and develop as a concept in the Italian Renaissance?
In the first period, Vulgar Latin spread into the usage of higher classes.
Another major systemic change was to the future tense, remodelled in Vulgar Latin with auxiliary verbs.
At one time, the Middle East, and Italian derived from Vulgar Latin has many.
In addition, Classical Latin borrowed words from Vulgar Latin which, in turn, borrowed words from the local languages.
Vulgar Latin comprised a set of ideas concerning the linguistic situation of the Latin speech community in antiquity.
On the other hand, standard Latin possesses many words not known to Vulgar Latin, and vice versa.
Latin or in Vulgar Latin, for the terms companio and companium.