Linguistics and language
Linguistics:-
Linguistics is the scientific study of language and its structure. It is the systematic study of language. It includes the study of grammar, syntax, and phonetics. Basically, it is concerned with the study of human language as a universal part of human behavior and thinking. Part of linguistics that is concerned with the structure of language is further divided into a number of subfields:
Phonetics – the study of speech sounds in their physical aspects.
Phonology – the study of speech sounds in their cognitive aspects.
Morphology – the study of the formation of words.

Language:-
The English word language derives ultimately from Proto-Indo-European *dn???wéh?s “tongue, speech, language” through Latin lingua, “language; tongue”, and Old French language. … Unlike conventional human languages, a formal language in this sense is a system of signs for encoding and decoding information.

Language is a set of signals by which we can communicate. The method of human communication, either spoken or written, consisting of the use of words in a structured and conventional way.

Properties of language:-

References:-
https://linguistics.ucsc.edu/about/what-is-linguistics.html