👉 In computer science, a "downtime" refers to a period of time when a system or process is unavailable for use by other users. This could include tasks that are being performed on a computer, such as sending emails or running programs, but also includes periods during which the system becomes inactive due to maintenance or repair work. In software development, downtime can be defined as any time an application or service is unable to perform its intended functions, usually because of hardware failures or other technical issues.