Cloud computing is the on-demand delivery of computing resources like servers and data storage over the internet. It allows businesses to access applications via the internet rather than maintaining their own hardware and software. Common service models for cloud computing include SaaS, PaaS, and IaaS. Salesforce is a leader in cloud computing, offering applications for CRM, sales, marketing, and more that are accessed via the internet rather than installed on-premise hardware. This allows companies to work as one team across connected applications and deploy enterprise-wide solutions more quickly than traditional on-premise models.