  The research work in the thesis is focused on the thermodynamic analysis of
cosmological models, especially the models that explain late-time cosmic
acceleration. According to the cosmological principle, the universe is
spatially homogeneous and isotropic. FRW metric is considered to describe it.
In the initial chapter, an overview of cosmology is presented. Chapter 2 delves
into thermodynamics applied to cosmology, emphasizing the Generalized Second
Law. It thoroughly covers Hayward-Kodama temperature and discusses the apparent
horizon and the conditions for thermodynamic stability. Chapter 3 presents a
thermodynamic comparison of quintessence models, focusing on thawing and
freezing scenarios. Chapter 4 examines Brans-Dicke cosmological models in a
spatially isotropic and homogeneous universe, assessing their compatibility
with the Generalized Second Law of Thermodynamics. Chapter 5 explores the
thermodynamic viability of various dark energy models reconstructed using the
cosmological jerk parameter. Chapter 6 examines a model in a spatially flat FRW
spacetime that mimics the characteristics of the $\Lambda$CDM model, assessing
its thermodynamic stability. Chapter 7 serves as the epilogue of this thesis,
offering not only the final conclusions but also a brief discussion on the
presented work and potential future prospects.
