How important is audience interaction or 'crowd work' in a stand-up comedy routine?

Audience interaction, often called 'crowd work,' can be a highly effective tool, though its importance varies by comedian and style. When executed well, it can build immediate rapport, create unique and spontaneous comedic moments, and make the audience feel more engaged and part of the show. It showcases a comedian's improvisational skills and quick wit, adding an unrepeatable dynamic. However, poorly handled or excessive crowd work can derail a set, so it requires careful judgment and skill.