Optus is an Australian telecommunications company that was established in 1981. It is a wholly-owned subsidiary of Singapore Telecommunications Limited (Singtel). Optus' headquarters is located in Macquarie Park, Sydney, Australia.

The company offers a wide range of products and services in the telecommunications industry, including mobile and fixed-line telephony, broadband internet, and pay television. Optus provides mobile services through its 3G and 4G networks, offering both prepaid and postpaid plans. In the fixed-line segment, Optus offers home phone and broadband services using various technologies such as ADSL, cable, and NBN (National Broadband Network).

In terms of its global operations, Optus primarily focuses on the Australian market. However, it has also established certain partnerships and joint ventures to extend its reach. The company operates subsidiaries such as Alphawest, an IT solutions provider, and Virgin Mobile Australia, a mobile virtual network operator.

Optus has also formed a joint venture with National Broadband Network Co to construct and operate Australia's broadband network. Optus holds a significant position in the Australian telecommunications market. It is the second-largest telecommunications provider in terms of market share, competing closely with Telstra.

Optus has a strong customer base and has made strategic investments to enhance its infrastructure and expand its network coverage. Over the years, Optus has achieved several milestones and undergone significant changes. In 1992, it became the first company to be granted a license in Australia to operate a fully digital network.

In 2001, Optus acquired the cable network of Cable & Wireless Optus, allowing it to provide pay television services. In recent years, the company has focused on investments in improving its network performance and expanding into new areas, such as offering bundled services and smart home solutions. Currently, Optus is continuing to innovate and adapt to the evolving telecommunications landscape.

It has made advancements in 5G technology, expanding its network coverage and investing in infrastructure to provide faster and more reliable services to customers across Australia. Optus remains committed to providing innovative solutions and maintaining its strong market position in the telecommunications industry