Dialog show how a character speaks so you can see the level of education and regional area where he or she lives.
It's prose.
dialog
Dialogue is what the character(s) is/are saying.
Yes, you can keep dialogue in script format by using the character's name followed by a colon and then the dialogue. For example: John: How are you doing today? Mary: I'm doing great, thanks for asking. This format helps to differentiate dialogue from narrative in a fiction story.
It depends on what sort of book you're writing. There can be dialogue if it's a fiction book. A nonfiction book usually does not contain dialogue.
insert a dialog choice a couple times into the dialog
Dialogue is essential in fiction because without it, you've got a dull, boring story. You can learn all about characters through the way they speak.
how to make a short dialog
Dialog Semiconductor was created in 1981.
The population of Dialog Semiconductor is 2,010.
Dialog Semiconductor's population is 400.
Troika Dialog was created in 1991.