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Expert reviewers and users often recommend specific third-party bundles to expand Illustrator's default library: Illustrator Brush Study | Wacom One

Adobe Illustrator includes five core brush types that allow you to apply unique visual styles to vector paths

The most complex. Pattern Brushes take a series of up to five tiles (start, side, end, inner corner, outer corner) and repeat them along a path. When you draw a square or a circle, the brush intelligently swaps tiles at the corners.

Vectors are typically known for their clean lines and scalability, but they can often feel "too perfect." Adobe brushes allow you to introduce the chaos, texture, and nuance of traditional media—like charcoal, watercolor, or calligraphy—into a digital environment that remains fully editable and resolution-independent.

To edit a brush you’ve already applied, double-click the brush icon in the Brushes panel, adjust the Colorization method, and click "Apply to Strokes."