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Definition: A grid is made up of columns, gutters, and margins that provide a structure for the layout of elements on a page. There are three common grid types used in websites and interfaces: column grid, modular grid, and hierarchical grid. Columns: Columns take up most of the real estate in a grid. Elements and content are placed in columns. To adapt to any screen size, column widths are generally defined with percentages rather than fixed values and the number of columns will vary. For example, a grid on a mobile device might have 4 columns and a grid on a desktop might have 12 columns.