An independent contractor is a worker who provides a service to a business but is not classified and treated as an employee. An independent contractor can be a self-employed worker or a business. Also, independent contractors don't solely work for one person or business. Instead, they work for multiple people and businesses.
1. Learn more about working with independent contractors with this book/ebook:
Working With Independent Contractors
2. IRS Forms associated with Independent Contractors: Form W-9 and Form 1099-NEC