On-demand
On-demand or on demand may refer to:

Manufacturing
Build-on-demand
Just-in-time manufacturing, a methodology for production
Print on demand, printing technology and business process in which new copies of a document are not printed until an order has been received

Computing and Internet
Certification on demand, a digital certificate process
Code on demand, a concept in distributed computing
Software as a service (SaaS), also referred to as on-demand software
On demand anti-virus protection, security tools used to detect and remove malware on an on-demand basis
Ballot on Demand, software used to generate paper ballots, provided by Election Systems & Software
Gaming on demand, a type of online gaming
On-demand event is pre-recorded materials available anytime
Content on demand:
Video on demand, a type of streaming video or movie service used by services such as Netflix
Music on demand, music streaming services like iTunes

Television and video media providers
Astro On Demand, base a subscription Hong Kong TVB Channel
Bell Fibe TV OnDemand
Comcast Xfinity OnDemand
On Demand (Sky), a video on demand service for BSkyB's Sky satellite TV service
OnDemand, UK-based TV company owned by the On Demand Group
Rogers Cable OnDemand
Time Warner Cable OnDemand

Other uses
Demand responsive transport, public transit service
Personal rapid transit, an on-demand transport service