DELETE FROM table_name
WHERE column OPERATOR value
[ AND | OR column OPERATOR value ]**

OPERATOR can be <,>, =, <=,>=, , or like

So to give you an idea of how this works, a working example:

DELETE FROM emp_details WHERE emp_id = 12345

In this example we are removing from table "emp_details" and field "emp_id" the value of "12345". The most common use for this would be if you have inserted the wrong data into a field. Using this method you can undo that mistake which allows you to go back in and re-insert that data.