# Consensus Network
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The primary role of consensus is for participants in the process to agree on which XRP Ledger transactions are to be processed as a group to resolve the double spend problem. This section covers concepts that help you learn the "what" and "why" behind fundamental aspects of consensus in the XRP Ledger.

* **[Consensus Principles and Rules](x)**

      Understand the principles and rules involved in reaching consensus in the XRP Ledger, including some background on the double-spend problem and details about how consensus works.
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* **[Validators and the Trust Topology](x)**
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* **[Amendments](x)**

      An amendment is a fully-functional feature or change, waiting to be enabled by the peer-to-peer network as a part of the consensus process. Understand the purpose of amendments and the amendment voting process.
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* **[Fee Voting](x)**

      Fees include basic transaction costs as well as reserve requirements. Validators can vote for changes to fees. Understand the purpose and process of fee voting.
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* **[Pseudo-Transactions](x)**

      Pseudo-transactions are never submitted by users, nor are they propagated through the network. Instead, a server may choose to inject them directly into a proposed ledger. If enough servers inject an equivalent pseudo-transaction for it to pass consensus, then it is included in the ledger. Understand the purpose and processing of pseudo-transactions.
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* **[Consensus White Papers](x)**

      Access these Ripple white papers to get a close-up look at the XRP Ledger consensus algorithm.
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