To help me understand what you're looking for, could you provide more details? For example:
* Where did you encounter the term "Sync" in relation to programming? (e.g., a book, a website, a specific project)
* What kind of programming language are you interested in? (e.g., scripting, compiled, object-oriented)
* What is the context of your question? (e.g., are you trying to learn a new language, or understand a specific concept?)
Once I have more information, I can provide you with a helpful response.