So, the CAP theorem helps you decide what's most important for your system when things get tough: having everyone see the same data, keeping the system working, or handling problems in the network. You can't have all three perfect at once, so you need to choose what fits best for what you're building.

ConsistencyAvailabilityPartition Tolerance
everyone see same datakeep the system workinghandling problems in network

network failure is a critical piece in CAP theorem

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