The insertion point looks like a solid vertical bar. In insertion mode , typing inserts characters in front of the insertion point, pushing the insertion point and characters behind the insertion point into higher columns within the same row. Thus, the row gets longer. In substitution mode typing replaces characters behind the insertion point with new characters. Pressing the Insert key on the keyboard toggles between the two modes.
Insertion is the default mode.
If the insertion point is in the middle of the row, then the Enter key breaks the row into two rows. Pressing the Back Space key deletes characters in front of the insertion point and moves it to the left and up. Pressing the Delete key deletes characters behind the insertion point. Moving the Insertion Point Moving the mouse moves the mouse cursor . The cursor is context sensitive.