A participatory budgeting (PB) algorithm is an algorithm for implementing participatory budgeting. The inputs to a PB algorithm are: a list of possible projects that require funding, the total available budget for funding the projects, and the preferences of voters over the project. The output of a PB algorithm is a partition of budget among the projects - determining how much money to allocate to each project. A PB algorithm can treat the projects as either divisible or indivisible: