Use Case - Difference between Include and Extend Notation

I see people always struggling with include/exclude notation inside use case diagrams. I think these diagrams could explain it better. use case diagram include…

Use Case Relationships Types.

Use case diagrams are UML diagrams describing units of useful functionality (use cases) performed by a system in collaboration with external users (actors).

SysML Use Case Models Enterprise Architect User Guide

use case - uml-include or extend - Stack Overflow

Putting The Inclusion Use Case In Focus - Business Analyst Articles, Webinars, Templates, Jobs

Use Case - Difference between Include and Extend Notation

Use Cases Alistair Cockburn, Writing Effective Use Cases, Addison-Wesley, Grady Booch, James Rumbaugh, and Ivar Jacobson, Unified Modeling Language. - ppt video online download

UML Use Case Diagrams: Tips

UML use case diagrams graphical notation reference - subject, actor, use cases, relationships between them, extend, include.

Use Case Diagram for Library Management System - GeeksforGeeks

What is the difference between extend and include functions in a use case diagram and their uses? - Quora

Use Case Modeling. What is use case modeling? Core concepts Diagram tour When to model use cases Modeling tips Example: Online HR System. - ppt download