# As a service

"X as a service" (rendered as *aaS in acronyms) is a phrasal template for any business model in which a product use is offered as a subscription-based service rather than as an artifact owned and maintained by the customer. The converse of conducting or operating something "as a service" is doing the same using "on-premise" assets (such as on-premises software) or lump sum investments. Originating from the software as a service concept that appeared in the 2010s with the advent of cloud computing, the template has expanded to numerous offerings in the field of information technology and beyond it. The term XaaS can mean "anything as a service".
The following is an alphabetical list of business models named in this way, including certain forms of cybercrime (criminal business models).
* B
* C
* D
* E
* F
* G
* I
* K
* L
* M
* N
* O
* P
* R
* S
* T
* W

## B
### Blockchain as a service (BaaS)

Blockchain as a service (BaaS) is an enterprise-level software service that allows businesses to use cloud-based solutions to build, host and use their own blockchain apps, smart contracts and functions on the blockchain infrastructure developed by a vendor. Just like the growing trend of using software-as-a-service (SaaS)

## D
### Data as a service (DaaS)
### Database as a service (DBaaS)

With a database as a service model (DBaaS), users pay fees to a cloud provider for services and computing resources, reducing the amount of money and effort needed to develop and manage databases. Users are given tools to create and manage database instances, and control users. Some cloud providers also offer tools to manage database structures and data. Many cloud providers offer both relational (Amazon RDS, SQL Server) and NoSQL (MongoDB, Amazon DynamoDB) databases. This is a type of software as a service (SaaS).

### Data management as a service (DMaaS)

Data management can also be done through the "as a service" business model, according to the book Data Management as a Service for Dummies.

### DDoS as a service (DDoSaaS)

DDoS-as-a-Service (DDoSaaS) is a cybercrime model in which individuals can hire hackers to execute an distributed denial-of-service (DDoS) attack against a specified target for a fee, typically paid in cryptocurrency, making such attacks more accessible to those without technical expertise.

### Desktop as a service (DaaS)

Remote desktop virtualization can also be provided via cloud computing similar to that provided using a software as a service model. This approach is usually referred to as cloud-hosted virtual desktops. Cloud-hosted virtual desktops are divided into two technologies:
* Managed VDI, which is based on VDI technology provided as an outsourced managed service, and
* Desktop as a service (DaaS), which provides a higher level of automation and real multi-tenancy, reducing the cost of the technology. The DaaS provider typically takes full responsibility for hosting and maintaining the computer, storage, and access infrastructure, as well as applications and application software licenses needed to provide the desktop service in return for a fixed monthly fee.

## E
### Other "EaaS" business models

Under the acronym EaaS, the following business models have been discussed in journals and conferences:
* Edge as a service
* Encryption as a service
* Energy as a service
* Evaluation as a service

## G
### Games as a service (GaaS)
### Ground segment as a service (GSaaS)

GSaaS means outsourcing ground operations to a third-party provider by the satellite operators.

## P
### Payments as a service (PaaS)
### Phishing as a service (PaaS)

Phishing as a service allows cybercriminals with little technical skills or without resources to launch sophisticated phishing attacks by providing access to a phishing kit.

### Platform as a service (PaaS)
## R
### Robot as a service (RaaS)
## S
### Software as a service (SaaS)
## T
### Transportation as a Service

Transportation as a Service (TaaS) is a transportation system where customers have use of a vehicle over just the time they need it and use of the vehicle may also be shared with other customers.

## W
### Workspace as a Service

Workspace as a Service (WaaS) is a desktop virtualization utilised by companies to offer to employees a complete computer environment with remote access.