What is "making software?" Is google search something they 'made' in 2004 and now everything since then is maintaining it? is it making software to support ne

What is "making software?" Is google search something they 'made' in 2004 and now everything since then is maintaining it? is it making software to support new hardware types, even if the old ones become unavailable? Is fixing a security issue 'making' software or maintaining it?