Microplastics (MPs), viz. nanoscale size plastic particles less than 5 mm in size, have emerged as a significant concern in the marine environment due to their ubiquitous presence and detrimental impact on aquatic ecosystems. It is estimated that there are approximately 51 trillion MPs in the seas, which is 500 times more than the number of stars in our galaxy. Marine organisms ingest these particles, leading to their accumulation and potential entry into the human diet through seafood consumption. Their detection and characterization remain challenging due to the diverse range of physical and chemical characteristics, along with their varying composition and concentration. Additionally, the rate at which fragmentation occurs in natural settings of MPs remains uncertain, even though they are typically generated from the breakdown of larger plastic items or product wear. This chapter focuses on current methods used for the quantitative and qualitative detection of MPs including visual inspection, spectroscopic analysis, and chromatography. It provides an in-depth examination of insulation methods, which encompass a spectrum of sampling, extraction, concentration, and purification techniques tailored to isolate MPs from complex marine matrices. These methods are specifically tailored to isolate MPs from the complex matrices of marine environments, aiming for an explicit understanding of MPs and mitigating the impacts of these pervasive pollutants.