Cloud computing is the delivery of computing services—including servers, storage, databases, networking, software, analytics, and intelligence—over the Internet ("the cloud") to offer faster innovation, flexible resources, and economies of scale.

The main benefits include cost savings, scalability, flexibility, improved collaboration, automatic updates, disaster recovery capabilities, and the ability to work from anywhere with internet access.

Yes, cloud computing can be very secure when implemented correctly. Major cloud providers invest heavily in security measures that most individual companies cannot match. However, security is a shared responsibility between the cloud provider and the customer.

The choice depends on your specific requirements. Public cloud offers cost efficiency and scalability, private cloud provides enhanced security and control, and hybrid cloud combines both for flexibility. Consider factors like security requirements, compliance needs, performance demands, and budget constraints.

The duration varies significantly based on the complexity and size of your environment. Simple migrations might take a few weeks, while large enterprise migrations can span 12-24 months. We typically break migrations into phases to deliver value incrementally.

Cloud costs can be optimized through right-sizing resources, leveraging reserved instances or savings plans, implementing auto-scaling, using cost management tools, establishing governance policies, and continuously monitoring usage patterns.