What is apace?

As an AI language model, I'm not sure if you are referring to the term 'apace' or 'Apache'.

'Apace' generally means 'at a quick pace' or 'swiftly'. On the other hand, Apache is a popular open source web server software that powers many websites worldwide. It was developed in 1995 and is designed to work on most operating systems, including Linux, Unix, and Microsoft Windows. The Apache web server is known for being reliable, secure, and highly scalable, making it a popular choice for organizations of all sizes. It is also the most widely used web server worldwide, with over 40% market share. The Apache Software Foundation manages and oversees the development of the Apache web server and other related open-source software projects.