There are multiple different 'account types' on Qortal.
Account types are related to the benefit that each account provides to the network.
Founder: A Founder account is that of a user who was integral in the creation of the Qortal platform.
The main purpose of the founder account setup is to ensure that the platform has what it needs in the beginning in a set of honest, online, and active nodes with which the platform will build a solid base. Also to serve as a group of accounts with slightly more influence to combat any 'bad actors' that attempt to level up to gain influence so that they can be less influential while the system is still in its infancy.
Eventually, as time goes on and accounts prove themselves legitimate by minting or storing data, the founder accounts' influence on the network will diminish overall. The founder accounts will initially start with a level of 'F' and that level will be maintained throughout their life. However, the weight of 'F' may eventually be decreased so that it is no higher than 10 (the max level of a 'normal' user). Therefore, founders are no more influential on the network than a normal user who has gone through the necessary means to prove himself to the network and provide input of what was needed to do so.
The founder 'F' level will be maintained as a mark demonstrating to the rest of the system that this account was indeed a founder. Whether or not that 'F' has any more influence than anyone else in the system.
'F' level can be up to level 15 depending on a need for the influence of the founders. During times of potential crisis, the 'F' level may be upped by vote or in very rare cases, by the development team's honest evaluation. This should not need to happen.
Initially, 'F' will be an influence of level 12 in terms of voting.
Founders have their own 'rewards pool' that comes from each block initially. This rewards pool may eventually be removed and placing founders in the same group as level 10 (max level) users. At this point, founders receive no additional benefit in terms of QORT rewards.
This model makes sense in the start of the system as the founders will be doing a lot of work and have already done a lot of work to get the system built and live. Therefore, a slightly larger rewards for a short amount of time seems fair. However, eventually, that will no longer be the case once the system is running flawlessly and all features planned have been implemented. At that point, founders will be placed into the same rewards group as the max level users.
Minter: Minter status is the status provided to those who have proven themselves via 'minter delegation' to a level 5 or higher account (or founder who as mentioned above are always enabled for minting delegation) with 'accept minting delegation' enabled.
Minters are the users in Qortal who are rewarded for, and complete the process of, finding blocks on the Qortal network. As in any other blockchain, finding blocks is necessary in Qortal. However, the rewards are completely different in Qortal's system.
Minters are initially the only users that can contain a 'level' in the system. Thus, the only users that can submit votes and deviate the future of the system by way of such votes.
Later, however, when the other account types such as 'Data Node', 'Data SuperNode', and 'Liquidity Provider' are created, they too will have a level. It is possible for other account types to be created as well, both by the development team and also by the process of creating a 'committee' via the delegation system.
The initial launch of Qortal, however, will only have Founder, Minter, and User account types.
User: A User on Qortal is anyone who is not assigned any other special account type. Simply put, anyone who does not want to become a minter, does not want to be a data node, doesn't want to provide liquidity, etc. (essentially 'anyone else' on the network).
Users have no special ability, cannot vote for changes in the system, and are not allowed to obtain rewards via the minting system.
Users CAN, however, use the trade portal, make transactions, earn QORT coin, or delegate to become a minter.
The process to become other account types aside from minter, have not fully been discussed by the current development team, and thus will not be explained in detail here yet.
Data Node: A future account type that will be discussed in detail when implemented.
Data SuperNode: Same as above.
Liquidity Provider: Same as above, with the modification that the Trade Portal will be the first service focused on post-launch of the beta network. So this account type will be able to be created sooner than the Data Node or Data SuperNode type.
A Liquidity Provider on the Qortal Network is a user that provides BTC on the sell side of the Qortal market. Initially only BTC/QORT pair will exist and only the BTC provided by users will entitle them to 'liquidity provider' account status.
As the system grows and gets more use, however, the modification of this to include users providing liquidity in multiple portions of multiple markets could potentially be voted into reality. (more are likely to come as the platform is developed further).