Finally, our intention is not only to spur development in these related areas by highlighting their common features and challenges, but also that the language currently used to describe such systems, which is still in development, is often, in our view, actively unhelpful. Thus, we have dedicated a section to the discussion of terminology and throughout we will largely avoid the use of "fuel", "dissipative" and "out of equilibrium", despite these being in common use. Finally, it is noteworthy that photochemical processes are not required to conform to microscopic reversibility, and hence, do not have the same rigid requirements as chemical equilibria. Nonetheless, some similar considerations should be applied when examining and designing chemical networks coupled to photochemical processes, which will be commented on at the end of this article.