Late-type stars with a similar internal structure to that of the Sun, supposed to operate a similar type of dynamo mechanism. However, the observations of these stars have introduced a range of stellar rotation periods, gravities, masses, and ages, which put into the debate on the existing magnetic dynamo theory. In order to provide useful constraints for the dynamo theory, I propose to carry out an in-depth study of the stellar surface and the outer atmosphere of the active low-mass stars using X-ray, FUV, NUV, optical, and NIR observations. I intend to study the highly time-resolved correlation of photosphere, upper chromospheric and coronal activity indicators, the rotational modulation, surface inhomogeneity, surface differential rotations, and flaring events. Study of these observational evidences of magnetic activities will be very useful to yield insight into the nature of the associated magnetic dynamos. I propose for three projects on which I like to work on during the given time-span at ARIES. For my study, I will use ARIES and national facilities. The multi-band study will help us to understand the magnetic activity on mid-M-dwarf which is not well explained by current magnetic dynamo theory. We have observed active binary CC Eri using ASTROSAT satellite in November 2016. Simultaneous observations in UV and X-ray would give us the chromospheric and coronal features of the binary system. Whereas, the time-resolved spectral analysis will allow us to investigate origin and mechanism of the emission of radiations in this system. We have investigated BLP on G-K dwarfs and found that the linear polarization in a majority of active dwarfs are due the combined effect of magnetic intensification and scattering, where the degree of polarization is strongly correlated with various activity parameters, especially at the blue end of the optical electromagnetic spectrum. There are only a few observations in the literature of BLP for the RS CVn stars. Therefore, making use of AIMPOL mounted on 1.04-m ARIES ST, we would like to do a similar study for evolved RS CVn binaries, which will provide important constraints to understand the magnetic activities in evolved stars.