EEG signals are mainly explained by the postsynaptic activities (excitatory and inhibitory) of synchronously activated neurons that generate extracellular electrical fields [1]. Typical signals detected on surface EEG are in the range of 20–150 μV peak to trough. The EEG is sensitive to both radial and tangential generators. The spatial EEG sampling is represented by the number of surface electrodes while the temporal sampling corresponds to the sampling rate (usually 256 Hz for routine EEG). It is possible to enhance the number of surface electrodes (up to 256), the sampling rate (up to 3000 Hz) in order to perform high resolution EEG, and also the recording time with continuous EEG (cEEG) monitoring. In clinical practice, EEG is easy to use and an inexpensive tool. EEG remains a critical investigation for epilepsies, sleep disorders, disorders of consciousness, psychiatric, cognitive disorders or encephalopathies [2]. EEG recordings are visually analysed by trained neurophysiologists and epileptologists. This visual analysis remains essential and irreplaceable. Quantitative analyses may be added, allowing the inspection of multiple aspects of electric signals not visible to the human eyes such as connectivity and microstates analyses. We overview in this article some recent progresses in visual EEG analysis and promising quantitative analyses.