The World Development Indicators are grouped into 5 categories:

1) People
2) Environment
3) Economy
4) States & Makets
5) Global links

These categories are shown in the combobox located on the screen's left most corner. You can refine your search of indicators by choosing an appropriate category, such as Economy.Once selected, all its subcategories are displayed on the screen's left panel. By clicking on a subcategory you'll find all its relevant indicators listed under it. Click on any indicator to see its definition and note, if any, which is displayed in the right panel of the screen.
You can also search for the interested indicators using the Indicator Search dialog box provided on the screen's right most corner.