Discrete time signals

The signals that are defined at discrete instants of time are called discrete time signals. The discrete time signals are discrete in time and continuous in amplitude. It is denoted by x(n).

The meaning of discrete in time is that the signal will be defined only in some specific intervals of time, on rest of the time values signal will be undefined. For example consider a continuous signal x(t) ,it will be defined for every value of 't'. To make it discrete time we take only values at a fixed interval T.
ie. x(nT)=x(t)|t=nT
We but simply denote it as x(n) instead of x(nT). where n=...-1,0,1,...

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