Answer
Horizontal: Add more instances (preferred).
Vertical: Add more CPU/RAM to a single instance (limited).
Quick Answer
Horizontal scaling: add more instances of a service. Stateless, easy to add/remove instances, scales well. Vertical scaling: give the existing instance more CPU/memory. Simpler, no code changes, but has hardware limits and requires restart. In microservices, horizontal is preferred. Scale the specific service that's the bottleneck, not the whole system.
S
SugharaIQ Editorial Team
Verified Answer
This answer has been peer-reviewed by industry experts holding senior engineering roles to ensure technical accuracy and relevance for modern interview standards.
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Source: SugharaIQ