What's "fill the gap" mean?

Native speaker’s answer
Rebecca
To "fill the gap" means to add something to make something complete or satisfy a need. Here it refers to a "gap" in the market, and a need that people have to collect data on the ocean. Ex: Can you fill the gap in the wall with plaster? Ex: Our product fills the gap in the market for people to easily organize and prioritize their tasks. Ex: I have a gap in my schedule on Monday. Do you wanna get coffee then?