An ‘active user’ is a user who signs into the LMS during a particular billing period (in our case, a month). When a user becomes active for a billing period, they can log in multiple times during that billing period. For example, if you have signed up for a 500 Active User Plan, that means 500 unique users can log into the system during the month before additional charges apply for any users that exceed 500. Typically, a charge of $2 per hour will be charged per month for users above the number of active users in your plan. So, if you pay $750 for a 500 Active User Plan, and if 525 unique users sign up that month, your bill for that month would be an additional $50.