Besides the actual words, a section of dialog can (should?) also contain the following:
Setting. The dialog should not take place in a white room, but the scene should also not start with a block of description. Instead, start the scene with as little description of setting you can get away with and then let the reader discover the rest as the characters interact with it.
Body language. Showing characters' emotions with body language are important. How are they sitting or standing? Are they moving around? What are they doing with their arms and hands? Legs? Feet? Facial expressions are of course also part of body language, but we usually "speak" with our whole body, even if we don't always realize we do.
Quirks and mannerisms. Both part of how words are spoken and body language, quirks and mannerisms can also be shown in dialog. Especially if the character is stressed or bored, but also to show character.
Dialog cues. How are the words spoken? Especially with images and symbolism, e.g. "a predator-on-the-move rhythm"
Subtext. Dialog is great for having characters not saying what they mean, and using that to make the scene deeper and the dialog more meaningful.
Thoughts. If you have a POV character their thoughts can be used not only to think about the scene but also to comment on it, even taking something that sounds straightforward and add subtext to it.
Visceral emotion. Also, if you have a POV character, you can use them to underline the climax of the scene (or some other important part) by showing the POV character having a visceral emotional response to what is happening.
Of course, you always do all of this in order to support the purpose of the scene, be that showing character or setting, revealing story twists, or something else any scene can do (see close to the end of this answer for a list of purposes).
If you want to read more about some of the things listed above, check out Margie Lawson's lecture on "Empowering Characters' Emotions." (You have to pay for it, but I really recommend it!)