<ul><li>CAP Theorem in System Design states that in a distributed system, you need to choose between consistency (C) or availability (A) when faced with a network partition (P).</li><li>In non-distributed systems, CAP Theorem does not apply as you can have both consistency and availability with one database.</li><li>Network partitions are inevitable in distributed systems and can lead to either prioritizing consistency (CP) or availability (AP) in system design.</li><li>System design examples like Social Media Feed and Flight Booking demonstrate how CAP Theorem is used to make decisions based on prioritizing either availability or consistency.</li></ul>

ELI5: CAP Theorem in System Design

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