Cloud-to-cloud integration refers to the process of connecting cloud-based applications with one another, typically through their APIs, allowing them to share specific data in predetermined time-based intervals or in near real-time. This type of integration can be categorized into internal or "direct" integrations and product integrations, which involve integrating a product with the applications clients use. Examples of cloud-to-cloud integration include routing warm leads to sales reps quickly, delivering personalized follow-ups to prospects, and enabling clients to add files to a product seamlessly. The benefits of cloud-to-cloud integration include opening up revenue opportunities, enabling employee productivity, enhancing the employee experience, and preventing excess spending. However, integrating cloud applications can come with significant obstacles, such as integration performance, scaling, and securing partnerships, which can be addressed by following best practices like testing integrations comprehensively and adopting a thoughtful process for evaluating and prioritizing integrations. Various tools are available to facilitate cloud-to-cloud integration, including robotic process automation software, integration platform as a service, embedded iPaaS, and unified API solutions, each with their own strengths and weaknesses.