Their sequence of mouse is as follows
When we click mouse following things happens in sequence
1)MouseDown
2)Click
3)MouseClick

lets see what are main differences between them

MouseDown event:
1)It helps us to identify which mouse button was pressed(ex: left,middle, right)

2) Does not fire through a keyboard

3)can also be used to give coordinates(X and Y coordinates where the mouse

was pressed)

Click event:
1)we cannot identify the mouse button that was pressed

2) Does fire through keyboard (enter, spacebar keys for example)

3)Does not give co-ordinates

MouseClick event:
1)Fires through the default button(Left Button)

2)Does not fire through keyboard.

3)Gives coordinates where the Mouse was clicked.