More or less, it's how stiff/inflated a cell is with water. Plant cells can become turgid as their strong cell walls prevent them from bursting. However, if too much water enters animal cells, they burst as they are not surrounded by a strong cell wall. These cannot become turgid.
In plant cells water enters the cell through at least two methods, but the important part is when the water is in the cell, building up in volume and pressing against the inner cell wall. The cell wall, obeying the laws of physics, pushes back until the pressure is equalized. maintaining structure and turgid conditions within the cell.
A turgid cell is one which absorb water to exert turgor pressure on its wall. This situation is obtained when osmotic potential in the cell is higher than its surrounding cell. It will then absorb water through endo-osmosis to become turgid.
Turgor is the normal rigid state of fullness of a cell or blood vessel or capillary resulting from pressure of the contents against the wall or membrane
Turgor is the term used by health care workers to assess the degree of fluid loss or dehydration. It also refers to the degree of skin's elasticity.
Adequate supply of water in to the cell, a semi-permeable membrane,fomation of osmotically active substance inside the cell
Water pressing against the cell wall. That simple. The water coming from the roots to the leaves through the xylem also has this function which keeps vascular plant erect.