HIGH LEVEL DESIGN It is simply a blueprint for the system. In other words, a generic system design that describes the overall architecture and design of a system.

1. System - is a set of components put together to build a product/feature.
2. Feature - is a set of requirement to be satisfied. System Design is necessary to ensure that a system meets specific requirements, such as performance, reliability, scalability, and maintainability. Without a clear blueprint, a system may not work as intended, leading to performance issues in the future, downtime, etc.

High-level design also includes:

1. Overall Architecture.
2. Database design
3. Main Components
4. Services and platforms