Viruses are intracellular parasites that come into existence when inside a suitable host, otherwise they exist as inanimate entities outside their host. General structure of virus comprises of nucleic acid (either DNA or RNA) surrounded by a protective protein layer called capsid which also plays a significant role in replicative machinery of viruses. Depending on the presence or absence of an additional lipid layer, viruses are further categorised into enveloped and non-enveloped viruses respectively. Capsid comprises of multiple copies of single or multiple proteins, predominantly arranged in helical or icosahedral symmetry. These multiprotein assemblies are found to be very stable under different external conditions. Our study aims at understanding the stability of these capsids and further deciphering their disassembly mechanisms. First part of the work focuses on understanding sequence and structural details at monomer level of viral capsid. Second part of the work involves developing a suitable coarse-grained model for capsid proteins that could capture the dynamics of involved protein at its atomistic resolution. Third part of the work involves exploring dynamics of whole capsid under the influence of various external factors. Hence, this study will provide an understanding about the composition, stability and dynamics of viral capsid.