The grid CSS property is a shorthand property that combines several other grid-related properties, including grid-template-rows, grid-template-columns, grid-template-areas, grid-auto-rows, grid-auto-columns, grid-auto-flow, and grid-gap. It provides a convenient way to define the overall grid structure and properties in a single declaration.

Here’s an example:

.grid-container {
  display: grid;
    "header header"
    "sidebar content"
    / 200px 1fr;
  grid-gap: 10px;

In this example, the grid property sets up a grid layout with two rows and two columns. The first row is for the header, the second row is divided into the sidebar and content areas. The columns are defined as 200px for the first column and the remaining space is divided equally using 1fr. Additionally, the grid-gap property sets a gap of 10px between grid items.

The grid property simplifies the declaration of grid-related properties, making it easier to define the grid structure, sizes, and gaps. It provides a powerful tool for creating flexible and responsive grid layouts.