Windows Server waa nidaam hawlgal (operating system) awood badan oo ay samaysay Microsoft, looguna talagalay server-yada iyo deegaannada ganacsiyada waaweyn (enterprise environments). Waxay bixisaa tiro badan oo astaamo iyo adeegyo ah oo lagama maarmaan u ah maareynta iyo sugidda kaabayaasha shabakadda. Mid ka mid ah qaybaha ugu muhiimsan ee Windows Server waa Active Directory, kaas oo ah adeeg hagitaan (directory service) oo keydiya macluumaadka ku saabsan walxaha shabakadda (objects on a network) isla markaana macluumaadkan u diyaariya isticmaaleyaasha iyo maamulayaasha. Active Directory wuxuu door muhiim ah ka ciyaaraa maareynta xisaabaadka isticmaalayaasha, kooxaha, kombiyuutarrada, iyo kheyraadka kale ee shabakadda. Waxay u oggolaanaysaa maamulayaasha inay xarun ka dhigaan oo ay si otomaatig ah u qabtaan howlaha sida xaqiijinta isticmaalaha (user authentication), xakamaynta helitaanka (access control), iyo maareynta siyaasadda kooxaha (group policy management). Iyadoo walxaha lagu abaabulayo qaab dhismeed sare-hoose ah (hierarchical structure), Active Directory wuxuu fududeeyaa maareynta kheyraadka shabakadda wuxuuna xoojiyaa amniga isagoo hirgelinaya siyaasado iyo ogolaansho (permissions). Marka lagu daro maareynta isticmaalayaasha iyo kheyraadka, Active Directory wuxuu kaloo taageeraa astaamo ay ka mid yihiin isku-dhafka Nidaamka Magaca Domain-ka (Domain Name System - DNS), taageerada Hab-maamuuska Helitaanka Hagitaanka Fudud (Lightweight Directory Access Protocol - LDAP), iyo adeegyada nuqul-samaynta (replication services) si loo hubiyo isku-consistant-nimada xogta ee dhammaan maamuleyaasha domain-ka ee badan (multiple domain controllers). Guud ahaan, Windows Server iyo Active Directory waxay bixiyaan goob adag oo lagu dhiso laguna dayactiro deegaanno shabakadeed oo ammaan ah, la balaadhin karo, oo hufan.