Streak can refer to different things depending on the context. It can be a line or mark of a different color or texture from the ground, like a stripe. It can also refer to a series of events or actions that happen over a period of time without a break, such as a winning streak in sports. Additionally, it can be used informally to describe a spell or run of something, like a streak of good luck. In the context of the software company, Streak is an American software company that developed a customer relationship management platform for Gmail.