This article covers three methods: the (quick but limited), the Custom Thick Underline (professional), and the Zigzag/Wavy Underline (creative).
You can underline text in Adobe Illustrator using a quick button in the Character panel or by drawing a custom line for more design control. Method 1: The Quick Underline Button underline in illustrator
Underlining text might seem like a basic Microsoft Word skill, but in Adobe Illustrator, it works a little differently. While there is a built-in "Underline" button in the Character panel, professional designers often avoid it. Why? Because the default underline is often too close to the text, too thin, and impossible to customize. This article covers three methods: the (quick but