There are many differences between communicative and informative language that can be discussed upon. To differentiate between those two, we need to know what the characteristics of the two are. This will give each of the two very different definition altogether although it overlapped in some of its system.
Communicative language is commonly known as the way people use language to communicate with other people, communication as it is better known. It is a process of transferring information from one entity to another. It is perceived better as a two-way process in which there is an exchange and progression of thoughts, feelings or ideas towards a mutually accepted goal or direction. All forms of communication require a sender, a message, and a receiver. The interaction requires some sort of activities that can be divided into two separate means which is verbal means, such as speech, song, and tone of voice, and there are non-verbal means such as body language, sign language, paralanguage, touch, eye contact, media (pictures, graphics and sound), and writing.
Verbal communication requires verbal means but visual aid can support the process. Often when we communicate face to face the body language and our voice tonality has a bigger impact than the actual words that we are saying. There are a few of verbal communication types: discussion, speeches, presentations and singing. It is possible to have a visual aid helping you to provide more precise information.
Meanwhile, non-verbal communication is the process of communicating through sending and receiving wordless messages. Such messages can be communicated through gesture, body language or posture; facial expression and eye contact, object communication such as clothing, hairstyles or even architecture, or symbols and infographics. Written texts have nonverbal elements such as handwriting style, spatial arrangement of words, or the use of emoticons. A portmanteau of the English words emotion (or emote) and icon, an emoticon is a symbol or combination of symbols used to convey emotional content in written or message form.
Informative language means how people use the language to inform or to give information to others. This is also done through verbal and non-verbal forms but focuses on the information or input of the communication. It is common that a person listening may be become informed via signals which have not intentionally sent. It can be said that information is something potentially perceived as representation, though not created or presented for specifically for that purpose. Means for information that can be presented includes in written forms that are books, encyclopedia, magazines, posters, flyers, journals, manuscript and the internet. Other means includes audio forms such as songs, singing and poetry reading, and visual forms such as pictures and movie clips.
There are not many differences between these two because they very much overlaps each other in its contents of discipline but the point is that it is a way of widening the contexts of language that can be utilised.