With the increasing use of IT technologies for maintaining the information, there is huge need for stronger intrusion detection mechanisms. The old usages like firewalls are not much so effective there are few new techniques that are used for the detection of intrusions. The various techniques of Intrusion Detection have been studied briefly. The main aim of this paper is to increase the accuracy with maximum and decrease with fewer false alarms. Also concern about reducing the disadvantages of the present IDS for large data. The intrusions enter the systems without any allowances to replicate files and running pirated software’s on their own to access systems and takes the very much confidential data like sensitive information. Intrusion detection can take care of the systems and if something suspicious happens the prompt will be given and monitored.