PayPal subscription vs recurring?

Question

Can someone explain the difference between the two? From what I have read, subscription is the one where you grab the HTML button from PayPal, whereas recurring is done via

Answer 1

And one more thing that I noticed.

When we make an API call to get the Transaction-details for a recurring/subscription transaction, the subscriptions which have their Profile-ID's starting with 'S-' have their TRANSACTIONTYPE as 'subscr_payment' and the subscriptions with Profile-ID's starting with 'I-' have their TRANSACTIONTYPE as 'recurring_payment'

Don't know if I am completely right.