This is an ER diagram for the hotel management system. A hotel management system is a collection of hotel software solutions that keep operations running smoothly. Accounting tools, customer relationship management (CRM) solutions, and a bewildering assortment of industry-specific software are available. An Entity Relationship (ER) Diagram is a form of flowchart that shows how "entities" such as people, things, or concepts link to one another inside a system. In the disciplines of software engineering, business information systems, education, and research, ER Diagrams are most commonly used to build or troubleshoot relational databases. They are also known as ERDs or ER Models, and they employ a predefined collection of symbols such as rectangles, diamonds, ovals, and connecting lines to illustrate the interconnectivity of entities, relationships, and their properties. Use EdrawMax' s easy online diagram editor to edit this diagram and export results to multiple image formats.