A tithe is a one-tenth part of something, paid as a contribution to a religious organization or compulsory tax to government. Today, tithes are normally voluntary and paid in cash or cheques or more recently via online giving, whereas historically tithes were required and paid in kind, such as agricultural produce. After the separation of church and state, church tax linked to the tax system are instead used in many countries to support their national church. Donations to the church beyond what is owed in the tithe, or by those attending a congregation who are not members or adherents, are known as offerings, and often are designated for specific purposes such as a building program, debt retirement, or mission work.