GitHub has announced its first-ever external investment with Andreessen Horowitz, despite the company's profitable and fast-growing status without needing external funds. The decision to collaborate with the venture firm is driven by a desire to enhance its products, solve more complex problems, and improve user experience across different platforms. GitHub values the innovative and software-centric philosophy of Andreessen Horowitz, aligning with their own vision of transforming software development. The partnership aims to make GitHub more accessible for beginners and more powerful for experts, facilitating easier collaboration and advancing the software development process.