Shadow DOM in LWC creates a protective space for markup and styling. This keeps internal styles from leaking out and external styles from messing with it. It’s key for making components that work well everywhere, especially in Salesforce Lightning.

Using the shadow DOM in LWC also improves performance. LWC uses native browser APIs for faster loading than other models. This choice not only speeds things up but also makes development easier.

LWC’s design, using html, JavaScript, and CSS, fits well with today’s JavaScript frameworks. This makes creating and keeping up components easy and effective. The DOM helps make components better by improving structure and interaction.