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Uniform resource locators, or URLs, are essentially web addresses.

On websites, URLs should be embedded in text.

More information is available on the NREL website.
NREL plays a critical role in CSP research.

In print, URLs should not be embedded in text. If a URL extends beyond one line of text, add a break at a solidus. Also, in general, you do not need to include the http:// prefix on most URLs. But test it before removing it. Shorten URLs as much as possible (e.g., remove unnecessary trailing such as /index.html) while ensuring functionality.