static Hazard and its types

A hazard, if exists, in a digital circuit causes a temporary fluctuation in the output of the circuit. In other words, a hazard in a digital circuit is a temporary disturbance in the ideal operation of the circuit which if given some time, gets resolved itself. These disturbances or fluctuations occur when different paths from the input to output have different delays and due to this fact, changes in input variables do not change the output instantly but do appear at the output after a small delay caused by the circuit-building elements, i.e., logic gates. There are three different kinds of hazards found in digital circuits
Consider a logic circuit that is expected to give a logic -1 output momentarily becomes logic-0, because of finite propagation delays of various gates this unwanted switching transient is called HAZARDS.

Static hazard
Dynamic hazard
Functional hazard
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