A

Apache HTTP Server: An open-source web server developed by the Apache Software Foundation that delivers HTML, CSS, JavaScript, and media to browsers over HTTP and HTTPS, primarily on Unix-like systems. Also known as: Apache, Apache Server, Apache Web Server.

B

Block Storage: A data storage approach in which data is divided into fixed-size, individually addressable blocks and presented to a server as a raw volume — typically over Fibre Channel or iSCSI. Favored for high-IOPS, low-latency workloads such as databases. Also known as: Block-Level Storage, Block Volume Storage.

Cloud Hosting: A web hosting model that runs applications and websites on a network of virtual servers backed by pooled physical hardware, with on-demand scaling of CPU, RAM, and storage. Functionally equivalent to Infrastructure as a Service (IaaS). Also known as: Cloud Server Hosting, Cloud Computing Hosting.
Colocation Hosting: A service where a customer places their own server hardware in a third-party data center and rents the supporting infrastructure: rack space, power, cooling, network connectivity, and physical security. The customer keeps full ownership of the hardware. Also known as: Colocation, Server Colocation.

Database Hosting: A managed service in which a hosting provider runs and maintains a database management system (such as MySQL, Microsoft SQL Server, or a vector database) on its infrastructure, handling server provisioning, security, backups, replication, and availability. Also known as: Managed Database Hosting, DBaaS.

HIPAA Business Associate Agreement (BAA): The HIPAA-required contract between a Covered Entity (or upstream Business Associate) and any third party — such as a hosting provider — that creates, receives, stores, or transmits Protected Health Information (PHI). Defines permitted uses, security requirements, breach-notification timing, and liability allocation. Also known as: BAA, Business Associate Agreement.

Infrastructure as a Service (IaaS): A cloud computing service model in which a third-party provider delivers virtualized compute, storage, and networking over the internet on a pay-as-you-go basis. The customer brings the OS, middleware, runtime, and applications. Also known as: IaaS.
Internet Information Services (IIS): Microsoft's web server for the Windows Server family. Delivers HTTP and HTTPS content via a modular request-processing pipeline, runs each application in an isolated worker process backed by an application pool, and integrates natively with ASP.NET and ASP.NET Core. Also known as: IIS, Microsoft IIS.

Managed Hosting: A hosting model in which the provider operates the server hardware and the software stack on top of it — operating system, security patching, monitoring, backups, and often middleware and applications — under a defined SLA. Also known as: Managed Server Hosting, Managed Services Hosting.
Microsoft SQL Server (MSSQL): A relational database management system from Microsoft using Transact-SQL (T-SQL). Runs natively on Windows Server and, since SQL Server 2017, on Linux and as containers. Bundles a database engine plus SSIS (Integration), SSRS (Reporting), and SSAS (Analysis) services. Also known as: MSSQL, SQL Server.
MySQL: An open-source relational database management system (RDBMS) using SQL. Originally developed by MySQL AB, now stewarded by Oracle. The canonical database in the LAMP stack and the backing store for WordPress and many other web applications.

PCI Hosting: A hosting service whose data center, network, and operational practices are aligned with the Payment Card Industry Data Security Standard (PCI DSS). Gives merchants and service providers a foundation for processing, storing, and transmitting cardholder data within the controls expected by the card brands. Also known as: PCI-Compliant Hosting, PCI-Ready Hosting, PCI DSS Hosting.
Platform as a Service (PaaS): A cloud computing service model in which a provider delivers a complete development and runtime platform — operating system, runtimes, middleware, databases, and management tooling — over the internet. Sits between IaaS and SaaS in the service-model stack. Also known as: PaaS.
Private Cloud Hosting: A cloud computing model in which compute, storage, and networking resources are dedicated to a single organization on single-tenant hardware — either on-premises or hosted by a managed service provider. Also known as: Private Cloud, Single-Tenant Cloud, Dedicated Cloud.
Private Hosting: An umbrella term for hosting arrangements in which infrastructure, databases, and servers are dedicated to a single organization rather than shared. Common forms include virtual private hosting (VPS) and private cloud hosting. Also known as: Private Server Hosting.

Server Virtualization: The practice of using a software layer called a hypervisor to partition a single physical server into multiple isolated virtual machines, each running its own operating system and applications. The foundation of modern cloud computing, VPS hosting, and consolidated data center deployments.
Software as a Service (SaaS): A cloud computing service model in which a provider hosts a complete application and licenses it to customers as a subscription, delivered over the internet via a web browser or API. The highest layer in the IaaS / PaaS / SaaS stack. Also known as: SaaS, SaaS Hosting.
Storage Area Network (SAN): A centrally managed, high-speed block-storage network that presents pools of raw data to one or more servers over a dedicated network — typically Fibre Channel or iSCSI — so attached hosts can use the storage as if it were directly attached. Also known as: SAN.

VMware: A virtualization and cloud-computing software vendor (a Broadcom subsidiary) whose products include the ESXi hypervisor, the vSphere management suite, vSAN software-defined storage, and the VMware Cloud portfolio.

Web Server Hosting: A service in which a hosting provider runs web server software (such as Apache, NGINX, or IIS) on its infrastructure to deliver a customer's website pages, files, and applications to visitors over HTTP and HTTPS. Also known as: Web Hosting, Website Hosting.