This Topic introduces the concept of a sampled data system, which aims to measure and store values from a continuous-time signal to produce a discrete-time representation. The video emphasis that perfect sampling is possible for band-limited signals, even though it may appear that signal values in the time-domain are discarded. This introductory video reminds the viewer of the Nyquist sampling rate, but then considers whether this value is reasonable in practice. The Topic highlights the importance of the anti-aliasing filters and the reconstruction filter, for ensuring that the original signal can be recreated as faithfully as possible. The full sampled data system is explained in detail, and an example of aliasing presented through a MATLAB demonstration.