You may or may not; it should make no difference. Both ways you will reach the same site.
To illustrate this with an example:
- maanojrakhit.com and www.maanojrakhit.com are always tied together
- This is because all websites are generally recognized by the "www" alias
- However, since maanojrakhit.com is the root of the domain, www.maanojrakhit.com wouldn't exist without it
- Technically, www.maanojrakhit.com is considered a subdomain of maanojrakhit.com