The ability to integrate Vue.js into existing projects easily sets it apart from many other frameworks. Whether you're working on a brand-new project or maintaining a legacy application, Vue.js's component-based architecture allows you to introduce Vue.js elements piecemeal without having to refactor existing code. You can embed Vue.js components where you need them, providing a pathway to gradually migrate large applications where refactoring everything at once may not be feasible.
Like ReactJS and Ember, Vue.js operates on a virtual DOM. The virtual DOM is a technique that involves keeping a virtual representation of the user interface in memory and syncing it with the 'real' DOM by a process known as reconciliation or diffing. The advantage of using a Virtual DOM is that it allows changes to be made very quickly because the entire page isn't re-rendered, just the elements that have changed.
In conclusion, Vue.js offers many advantages, including small size, ease of understanding, excellent integration capabilities, and the use of a virtual DOM. These advantages result in a fast, user-friendly experience that empowers both developers and end-users. Whether it's used in a small project or a larger, complex application, the benefits of Vue.js make it an excellent choice for front-end development.