Three-tier architecture, database management system, DBMS, modern, sleek, futuristic, silver metallic structure, multiple servers, CPUs, RAM, storage devices, network cables, routers, switches, firewalls, databases, queries, transactions, data warehousing, ETL process, data mining, OLAP, relational model, entity-relationship diagram, SQL language, database administrator, monitoring dashboard, system architecture, infrastructure, IT department, office building, cityscape, morning light, soft focus, shallow depth of field.