inserts

to put or place in: to insert a key in a lock.

to introduce or cause to be introduced into the body of something: to insert an extra paragraph in an article.

something inserted or to be inserted.

an extra leaf or section, printed independently, for binding or tipping into a book or periodical, especially a leaf or section consisting of an illustration or advertisement printed on different paper.

any small picture, device, etc., surrounded partly or completely by body type.

a paper, circular, etc., placed within the folds of a newspaper or the leaves of a book, periodical, etc.

Movies, Television. a cut-in.