Intro (noun)

1. A short introduction or opening to something, such as a song, speech, or book.
2. A short or brief introduction to a person, topic or subject.

Origin:

From the english word "introduction" which is a shortened version of the word.

Examples:

1. The intro to the song was a short instrumental piece.
2. The intro of the book gives a brief overview of the story.
3. The intro was a short speech given by the host to welcome the guests.
4. The intro was a brief introduction to the topic and its significance.
5. The intro of the presentation was a video that set the scene for the talk.