Our subscriptions are either monthly or annual and you are signing up for that period of time. If you purchase monthly, you are basically purchasing for the month and can cancel at any time. You can purchase and cancel before the month expires and you will only pay for one month. When the month expires, you will be charged again and then will be a subscriber for another month but can then still cancel at any time.
With the annual, it is the same but you are prepaying for the entire year. You can cancel at any time during the year but you will still have access until the annual anniversary date which is when your account will expire and you will not get any money back if you cancel with months remaining until your renewal.