Australia Post is the leading postal service provider in Australia. It's a government-owned enterprise that had existed since 1901, when it was initially established as the Postmaster General's Department. Over the years, the organization has changed, including a corporatization process in 1989, which resulted in its current name and organizational structure. 

Australia Post is a government-owned entity that delivers mail and parcels to individuals and businesses nationwide. It offers a broad range of postal services, including letter delivery, express post, parcel delivery, and retail. Moreover, Australia Post has expanded its operations to include digital services and financial products like banking and money transfers.

Australia Post's headquarters is on Bourke Street in Melbourne, where you'll find one of its post offices. With a vast network of post offices and distribution centers across Australia, Australia Post is pivotal in facilitating communication, e-commerce, and trade within and internationally. Its commitment to providing reliable and efficient postal services has made it an integral part of the Australian community.