Video conferencing is a form of real-time communication in which people in different locations communicate using live video and audio transmitted through a communications network. Participants normally use cameras, microphones, speakers or headphones and a software application or dedicated conferencing system. Unlike ordinary voice calls, video conferencing provides visual information such as facial expressions, gestures, demonstrations, presentations and shared physical environments. Unlike asynchronous video messaging, conventional video conferencing is generally interactive and allows participants to communicate simultaneously. The underlying technology can operate across local networks, private networks or the public internet, depending on the deployment. Modern video conferencing platforms commonly provide additional capabilities such as screen sharing, text chat, recording, virtual backgrounds, captions, participant management, meeting scheduling and collaborative documents.
A video conference typically works by capturing audio and video at each participant's device, compressing the resulting media streams, transmitting them across a network and decoding them at the other participants' devices. Video compression is essential because raw high-resolution video contains enormous amounts of data. Codecs encode the visual information into a more efficient representation and decoders reconstruct it for display. Audio is similarly encoded using an appropriate codec.
A conferencing service must coordinate these streams so that audio and video remain sufficiently synchronised while accommodating differences in network conditions. Packet-based internet communication can experience latency, jitter, packet loss and variable bandwidth, so conferencing software uses buffering, adaptive bitrate techniques, error-handling mechanisms and other methods to maintain a usable conversation.
Video conferencing technology predates modern internet meeting applications. Early systems used specialised telecommunications networks and expensive dedicated equipment, often limiting video communication to large businesses, research institutions and government organisations. Improvements in digital video compression, broadband networks, personal computers and webcams gradually reduced those barriers. Internet Protocol-based video communication became increasingly practical as broadband connectivity expanded, and web-based conferencing services eventually made participation possible from ordinary computers and smartphones. The widespread availability of cameras and microphones in laptops and mobile devices further reduced the need for specialised hardware. The result is that video conferencing has developed from a specialist telepresence technology into a general-purpose communication medium.
The network architecture of a video conference can vary. Some systems use central servers that receive participants' media streams and redistribute or process them, while others may use more distributed architectures or a combination of approaches. A central service can provide features such as recording, moderation, transcoding and participant management. Selective forwarding systems can route encoded streams without fully decoding and re-encoding every video stream, potentially improving efficiency. Network topology and server location influence latency, bandwidth consumption and scalability. Large meetings can require sophisticated media infrastructure because a participant cannot simply send an independent high-quality stream directly to every other participant indefinitely. Modern systems therefore use media servers and network optimisation techniques to manage the communication efficiently.
Video conferencing has applications in business meetings, remote education, healthcare consultations, interviews, customer support, training, conferences, family communication and collaborative work. Organisations can reduce the need for physical travel by allowing participants to communicate remotely. Educational institutions can connect learners with instructors or guest speakers in other locations. Healthcare services can use video communication for appropriate remote consultations, subject to clinical, legal and privacy requirements. Businesses can conduct interviews and demonstrations without bringing participants together physically. However, video conferencing does not perfectly reproduce face-to-face communication. Camera framing, audio quality, network delay and limited visual fields can reduce the amount of contextual information participants receive.
Quality depends on several interacting factors. Camera resolution and image processing influence visual clarity, while microphone quality and acoustic conditions strongly affect perceived communication quality. Network bandwidth influences how much media can be transmitted, but bandwidth alone does not determine quality because latency, jitter and packet loss also matter. Conferencing applications may dynamically reduce video resolution or frame rate when network conditions deteriorate. Echo cancellation prevents a participant's microphone from retransmitting sound from their speakers, while automatic gain control can help maintain consistent audio levels. Noise suppression can reduce background sounds. These processing techniques are essential because conversational audio is particularly sensitive to interruptions, delay and acoustic feedback.
Security and privacy are important aspects of video conferencing. A conferencing system may handle video, audio, screen content, chat messages, files, meeting metadata and participant identities. Platforms therefore use authentication, access controls, encryption and administrative controls to reduce unauthorised access. Encryption in transit protects data while it travels across networks, while some systems provide additional end-to-end encryption modes under particular conditions.
Meeting links and access codes should be managed carefully because possession of a meeting invitation can sometimes enable unwanted participation. Organisations may also need policies governing recording, storage, transcription and access to meeting content. The exact security properties depend on the platform, configuration and deployment architecture rather than on the phrase video conferencing itself.
Video conferencing is related to teleconferencing, web conferencing and telepresence, but the terms are not identical in every context. Teleconferencing is a broader term for remote conferencing and can include audio-only communication. Web conferencing commonly refers to browser or internet-based meetings and may include screen sharing and collaboration with or without video. Telepresence emphasises creating the experience of being present with remote participants and can involve specialised cameras, displays and spatial audio. Modern software frequently combines all these capabilities, making terminology overlap. The fundamental defining feature of video conferencing is interactive real-time communication in which live visual and audio information is exchanged between geographically separated participants.
