Chapters 1 and 2 of Getting to Know Web GIS introduce the foundations of what makes Web GIS such a powerful evolution of traditional geographic information systems. Chapter 1 focuses on how Web GIS moves mapping and analysis into the online environment, allowing for greater accessibility, interactivity, and collaboration. Instead of being limited to desktop software, users can now create, share, and analyze spatial data through browsers and mobile apps. This shift transforms GIS from a specialized tool used by experts into a connected platform that supports teamwork, decision-making, and public engagement. Chapter 2 explores the structure of GIS data, including the differences between vector and raster formats, how feature layers are organized, and why coordinate systems and map projections are crucial for accuracy. Understanding how data aligns spatially ensures that maps are not only visually appealing but also meaningful for analysis.