Blockchain is a one of emerging technology for decentralized and sharing of transactional data across a large peer to peer network, where non-trusting members can interact with each other without an intermediary, in a verifiable manner. In this paper, we review the basics of Blockchain, its applications, types, and working of Blockchain. Behind this innovative technique, the security, privacy issues and Consensus mechanisms of this technology are also important and are a matter of concern. The problems associated with Blockchain technology are also discussed in this paper.

Big data is the term for any gathering of information sets, so expensive and complex, that it gets to be hard to process for utilizing customary information handling applications. The difficulties incorporate investigation, catch, duration, inquiry, sharing, stockpiling, Exchange, perception, and protection infringement. To reduce spot business patterns, anticipate diseases, conflict etc., we require bigger data sets when compared with the smaller data sets. Enormous information is hard to work with utilizing most social database administration frameworks and desktop measurements and perception bundles, needing rather enormously parallel programming running on tens, hundreds, or even a large number of servers. In this paper there was an observation on Hadoop architecture, different tools used for big data and its security issues.

Web Applications security has turned out to be logically more essential nowadays. Tremendous quantities of assaults are being sent on the web application layer. Because of emotional increment in Web applications, security gets helpless against assortment of dangers. The ma-jority of these assaults are focused towards the web application layer and system firewall alone can't keep these sorts of assaults. The essen-tial explanation for achievement of these assaults is the numbness of utilization designers while composing the web applications and the vulnerabilities in the current advancements. Web application assaults are the most recent pattern and programmers are attempting to abuse the web application utilizing diverse strategies. Different arrangements are accessible as open source and in business showcase. Be that as it may, the choice of appropriate answer for the security of the authoritative frameworks is a noteworthy issue. This overview paper looked at the Web Application Firewall (WAF) arrangements with critical highlights essential for the security at application layer. Basic examination on WAF arrangements is useful for the clients to choose the most appropriate answer for their surroundings.

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