Redirect http:// to http://www website Url using htaccess

For SEO purpose we need to redirect http://example.com to http://www.example.com

Find the below htaccess code for redirection:

.htaccess code for redircet:
 
RewriteEngine On
RewriteCond %{HTTP_HOST} !^www.example.com$ [NC]
RewriteRule ^(.*)$ http://www.example.com/$1 [L,R=301]