Registration vs. Subscription

My registration has a different expiration date than my Subscription.

Why is this? What is the difference between the two?

Registration of what ?
Subscription for what ?

Registration is normally associated with the free version and Subscription is normally associated with paid products.

However, it seems that Registration and Subscription is used in different parts of both products. For instance in the free version User Interface > Settings > Registration section, then has ‘Your Subscription’ as the heading in the window.

What avast product are you using ?
Where are you seeing these differences (a screenshot would be appreciated) ?