As a cloud-based service, Salesforce can be accessed from anywhere, is easy to customize as a business grows, and works on a multi-tenant model, meaning every user gets automatic upgrades three times a year without any manual maintenance.
It's also straightforward to use day to day: logging in works like visiting any website, and the platform's reporting tools are powerful enough to support detailed business analytics while still being fully customizable to what a given team actually needs to see.