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Definition of Terms

Field

A field is the whole Sudoku grid.

Cell

A cell is the smallest sub divison of a Sudoku:

The smallest sub divison of a Sudoku
      is a cell

Block or 3x3 Sub Grid

A "block" or "3x3 sub grid" is a square of three times three cells. The upper left corner has to be in the first, fourth or seventh row and in the first, fourth or seventh column:

A block (or 3x3 sub grid) is a
      square of 3x3 cells.

Entity

An entity is a row, column or a block.