"Molecular crystals" means in general what you say, i.e. crystalline materials consisting of small molecules, as distinct from e.g. ionic crystals such as NaCl. These are very common; most organic compounds in the solid state form molecular crystals. These are in no sense "novel advanced materials".
However, some people seem to use the term in a narrower sense, e.g. there is a journal "Molecular Crystals and Liquid Crystals", where (judging from a quick look at a few abstracts) "molecular crystals" seems to mean, or at least to focus on, molecular crystals in which the molecules are organised into larger scale structures by specific intermolecular interactions stronger than van der Waals forces but weaker than covalent bonds, e.g. hydrogen bonds or π - π interactions. These materials can have interesting properties e.g. optical or electronic. Perhaps this is what your presentation is about. But as there are already terms for this sort of thing, such as "supramolecular chemistry" and "self-assembled structures", I see no need to appropriate "molecular crystals" to mean a small subset of itself.