Botnets represent a huge and developing danger against digital security as they give a dispersed stage to numerous digital wrongdoings, for example, Distributed Denial of Service (DDoS) assaults against basic targets, malware scattering, phishing, and click fraud[3][4]. Botnet
discovery has been a noteworthy examination point as of late. Specialists have proposed a few methodologies for botnet discovery to battle botnet danger against digital security.
In this review, botnet wonder will be cleared up and progresses in botnet location systems will be examined. This study differentiates botnet identification approaches into four classes: signature-based, abnormality based, DNS-based, and mining-based. Moreover, it compresses botnet recognition procedures in every class and gives a brief examination of these strategies. The rest of the paper is sorted out as: Section II depicts botnet marvel. In this area, botnet qualities and botnet life-cycle are disclosed to give better comprehension of botnet innovation. Area III talks about botnet discovery and following. In this area four classes of botnet identification approaches including mark based, oddity based, DNS-based, and mining-based are talked about separately. Area IV gives a brief examination of botnet discovery systems. The overview finishes up in Section V.