The top 10 most popular programming languages globally in 2021 according to various surveys and rankings are:

1. Python: Python has gained immense popularity due to its simplicity, versatility, and extensive range of libraries and frameworks.
2. JavaScript: JavaScript is widely used for front-end web development, and its popularity has further increased with the rise of frameworks like React and Vue.js.
3. Java: Java continues to be popular for enterprise-level development, Android app development, and large-scale projects.
4. C#: C# (C Sharp) is commonly used for Windows app development, game development with Unity, and enterprise-level applications on the .NET framework.
5. C/C++: C and C++ are foundational languages used for systems programming, embedded systems, game development, and performance-critical applications.
6. TypeScript: TypeScript is a statically-typed superset of JavaScript that adds features like type checking and interfaces, making it popular among developers working on larger JavaScript projects.
7. PHP: PHP is a server-side scripting language primarily used for web development and powers many popular content management systems like WordPress and Drupal.
8. Go: Go, also known as Golang, is a language developed by Google and is favored for its simplicity, concurrency features, and scalability.
9. Swift: Swift is the primary language for developing iOS and macOS applications, and its popularity continues to increase in the Apple developer community.
10. Kotlin: Kotlin is an official language for Android app development and is gaining popularity due to its enhanced features, compatibility with Java, and improved developer productivity.

Please note that rankings may vary depending on the source and region, and popularity can change over time.