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Chord is a protocol and algorithm for a peer-to-peer distributed hash table. The protocol controls how keys are assigned to nodes and how a searching node can find the node responsible for a given key. Suitable for distributed systems that require efficient key/value lookups, such as peer-to-peer file sharing.

Raft is a consensus algorithm that's designed to be easier to understand than Paxos while still ensuring consistency across a distributed system. Suitable for systems where it's essential to have a strong leader and understandability of the algorithm is highly valued.

Paxos is a consensus protocol that allows a collection of computers to agree on a proposed input value in a distributed system. It is suitable for fault-tolerant distributed systems where there might be failures or message loss.

MapReduce is a programming model and an associated implementation for processing and generating big data sets with a parallel, distributed algorithm on a cluster. It's suitable for large-scale data processing systems like search engines or big data analytics.