# Summary

Abstraction is a goal; the abstract keyword is one C# tool for reaching it. Choose an ordinary, virtual or abstract method by whether derived classes keep, may change or must write it.

![Cheat sheet: Summary](https://fsdtrainingmedia.blob.core.windows.net/public/images/2026/11/53cfe9afe87246e080a61816d80f32a9.webp)

- Category: C#
- Level: Journeyman
- Tags: abstraction, c-sharp, OOP, Virtual Method (c-sharp)
- Updated: November 3, 2026

Source: https://www.ask-codey.com/cheat-sheets/abstraction-in-csharp-summary-cheat-sheet