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A continuous time signal(CT) is one that is defined for all time t contained in some interval on the real line. This simply means that a CT will have a value every instant of time. Examples of CT include temperature, pressure, sound, etc.

A discrete time signal on the other hand is occurring at distinct separate points in time. The word discrete can be explained as having a correspondence between itself and N the set of natural numbers.

**s(n) = s(nD)**

**Key differences **

- Discrete time is gotten from continuous time signals
- Discrete time signals are finite from point to point, continuous is infinite