The display property in CSS is fundamental for controlling the layout of elements on a webpage.It determines how an element is displayed, how it interacts with other elements, and whether it participates in the document's layout.The display property can take values such as block, inline, inline-block, none, flex, grid, table, table-row, table-cell, initial, inherit, unset.Block-level elements take up the full width available, start on a new line, and include div, h1, p, section.