Salesforce helps you manage your customer relationships, integrate with other systems, and build your own applications.

Salesforce.com is a web based CRM tool that helps us to maintain the relationship with the customers.

Salesforce.com is a good example for Cloud computing services.

Salesforce.com uses Multi tenant architecture.

Different Clouds in Salesforce.com:

Sales Cloud
Service Cloud
Marketing Cloud
Experience/Community Cloud
IOT Cloud
Commerce Cloud
Integration Cloud
Health Cloud
Financial Services Cloud
Philanthropy Cloud
Wave Analytics