--- title: Learn Computing from the Experts | The Rheinwerk Computing Blog (14) description: Dive into programming, web development, and more with Rheinwerk Computing Blog! Your go-to resource for expanding your computing knowledge. (14) --- [![Rheinwerk Computing Logo](https://blog.rheinwerk-computing.com/hubfs/computing_logo-header.svg)](https://blog.rheinwerk-computing.com/) [Blog](https://blog.rheinwerk-computing.com) - Books - Get an overview of our wide selection of books on every relevant computing topic. - [General Computing](https://www.sap-press.com/rheinwerk-computing/general-computing/) - [DevOps](https://www.sap-press.com/rheinwerk-computing/devops/) - [Programming Languages](https://www.sap-press.com/rheinwerk-computing/programming-languages/) - [Security](https://www.sap-press.com/rheinwerk-computing/security/) - [Software Development](https://www.sap-press.com/rheinwerk-computing/software-development/) - Book Subscription - Get unlimited access to all Rheinwerk Computing books! - [Programming Subscription](https://sap-press.com/subscriptions/) ![](https://blog.rheinwerk-computing.com/hs-fs/hubfs/How%20to%20Write%20Your%20Own%20Python%20Functions.jpg?width=1000&name=How%20to%20Write%20Your%20Own%20Python%20Functions.jpg) [Featured](https://blog.rheinwerk-computing.com/tag/featured) | Featured article ## [How to Write Your Own Python Functions](https://blog.rheinwerk-computing.com/how-to-write-your-own-python-functions) Functions in Python provide functionality that you or someone else has already pro­grammed. In this post, we’ll teach you how to write your own Python functions. ![Rheinwerk Computing](https://blog.rheinwerk-computing.com/hubfs/RW-logo-300x300.png) by [Rheinwerk Computing](https://blog.rheinwerk-computing.com/author/rheinwerk-computing) [Read More](https://blog.rheinwerk-computing.com/how-to-write-your-own-python-functions) # Latest Blog Posts [![Basic Principles of Android and iOS Security](https://blog.rheinwerk-computing.com/hs-fs/hubfs/Basic%20Principles%20of%20Android%20and%20iOS%20Security.png?height=600&name=Basic%20Principles%20of%20Android%20and%20iOS%20Security.png)](https://blog.rheinwerk-computing.com/basic-principles-of-android-and-ios-security) [Cybersecurity](https://blog.rheinwerk-computing.com/tag/cybersecurity) ## [Basic Principles of Android and iOS Security](https://blog.rheinwerk-computing.com/basic-principles-of-android-and-ios-security) In this blog post, we’ll cover the essential security features that the Android and iOS platforms come with out of the box. ![Rheinwerk Computing](https://blog.rheinwerk-computing.com/hubfs/RW-logo-300x300.png) by [Rheinwerk Computing](https://blog.rheinwerk-computing.com/author/rheinwerk-computing) [Read More](https://blog.rheinwerk-computing.com/basic-principles-of-android-and-ios-security) [![What Are Callback Functions in JavaScript Programming?](https://blog.rheinwerk-computing.com/hs-fs/hubfs/What%20Are%20Callback%20Functions%20in%20JavaScript%20Programming_.png?height=600&name=What%20Are%20Callback%20Functions%20in%20JavaScript%20Programming_.png)](https://blog.rheinwerk-computing.com/what-are-callback-functions-in-javascript-programming) [Programming Languages](https://blog.rheinwerk-computing.com/tag/programming-languages) ## [What Are Callback Functions in JavaScript Programming?](https://blog.rheinwerk-computing.com/what-are-callback-functions-in-javascript-programming) The reference to a function in JavaScript can be transferred to another function for internal use. ![Rheinwerk Computing](https://blog.rheinwerk-computing.com/hubfs/RW-logo-300x300.png) by [Rheinwerk Computing](https://blog.rheinwerk-computing.com/author/rheinwerk-computing) [Read More](https://blog.rheinwerk-computing.com/what-are-callback-functions-in-javascript-programming) [![What Is SQL?](https://blog.rheinwerk-computing.com/hs-fs/hubfs/What%20Is%20SQL.png?height=600&name=What%20Is%20SQL.png)](https://blog.rheinwerk-computing.com/what-is-sql) [Programming Languages](https://blog.rheinwerk-computing.com/tag/programming-languages) ## [What Is SQL?](https://blog.rheinwerk-computing.com/what-is-sql) Hello there! 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