Aptamers are in vitro or in vivo generated bio-candidates from a synthetic library using amplification and separation procedures and have delicate options to label at the ends of properly folded secondary or tertiary structures. Aptamers are used as source molecules for sensor development since they can easily conjugate with nanomaterials and report the interactive output. Various sensing systems with enhanced sensitivity have been built in the past using aptamer conjugations. Despite the fact that the techniques for aptamer immobilization vary with functionalization chemistries, the essential strategy is reporting the presence of a specific target for sensing purposes, called an 'aptasensor'. Various attempts to analyze aptamer-ligand interaction advance the gallery of aptamer-based sensors. Aptamer administration is generally being investigated as the recognition element in high-performance analysis, and has been promoted as the exemplary molecule to mimic and replace antibody-based sensing. Using existing technologies, aptasensors are proven for more sensitive clinical and serological biomarkers sensing and high-throughput analysis.