Juxtaposition in literary terms is the showing contrast by concepts placed side by side. An example of juxtaposition are the quotes "Ask not what your country can do for you; ask what you can do for your country", and "Let us never negotiate out of fear, but let us never fear to negotiate"
If it was explaining what something means then it would show in a book or something, inventing new situations is not it because if you see a picture of a juxtaposition you will see that it means people or something being side by side.
