Which two principles from SOLID are most similar in their essence and application?

Of the five SOLID principles, two are most similar in essence and practice — the Single Responsibility Principle (SRP) and the Interface Segregation Principle (ISP).

• SRP states that a class should have only one reason to change, meaning it should be responsible for a single specific task.
• ISP recommends creating narrowly focused interfaces so that clients do not depend on methods they do not use.

Both principles aim to reduce coupling and increase code modularity. SRP focuses on dividing responsibilities within classes, while ISP emphasizes separating interfaces for clients. Ultimately, both contribute to cleaner architecture and easier maintenance.