The term "in situ" in electrochemistry refers to conducting electrochemical experiments under the working conditions of the electrochemical cell, i.e., under potential control. Potential regulation protects the electrochemical environment necessary to sustain the double layer structure and the electron transfer processes taking place at that specific potential in the electrode/electrolyte interphasial region. By introducing stimuli to samples directly inside the electron microscope, in situ methods allow researchers to engage with the material. This enables us to examine dynamic, evolving systems and utilise the electron microscope as a real-time nanoscale laboratory to fill in the gaps concerning dynamic, developing processes that we can't detect by any other method.