Final answer:
The National Guideline Clearinghouse is an Open access database that offers evidence-based clinical practice guidelines to the public and healthcare professionals, without the need for a subscription.
Step-by-step explanation:
The National Guideline Clearinghouse is Open access and publicly accessible. It is a platform that provides detailed information about evidence-based clinical practice guidelines. The purpose of the National Guideline Clearinghouse is to provide healthcare professionals and the public with access to quality guidelines for clinical care and promote the use of such guidelines to improve patient outcomes. The Clearinghouse does not require a subscription, fees, or any restrictions for the users, which makes it readily available to anyone looking for guideline information.