noun, verbal noun
A versus talk is when you sit down with another person and have a talk. As you're talking, it might evolve into a discussion. Or perhaps you're there to have an interview.
対談 is usually a formal discussion between two or more individuals, often organized ahead of time, and with a specific purpose or topic in mind.
This is a jukugo word that uses the on'yomi readings of the kanji. You should be able to read this on your own.
to watch a dialogue
to carry out a dialogue
to have a conversation
I went to an event for discussions between engineering and psychology scholars.
Last week, a discussion was held between a famous writer and a genius modern artist.
This month's issue should have my interview.