The internet has been a boon to mankind. Just type a few words in your search engine and you will find innumerable websites with immense information. The latest fad of social networking websites has brought people closer to one another; you might meet your long lost kindergarten friend here. Ecommerce has added to our convenience and email has made communication easier tenfold. Internet has given us so much but we still cannot its ill-effects. Its limitless, unbounded attribute could be a cause behind children losing their innocence at a young age. An internet filter is what you need to stop that. Applications are a type of software which is created with the intention of making a particular task easy for a user such as spreadsheets. With the increase in application threats, it has become essential to encompass an application security means in our computer system. It involves taking suitable measures throughout the life cycle of an application to prevent any unauthorized intrusion. Internet Filter filters or blocks the view of certain internet websites which has objectionable content that is unfit for the viewing of children. There are many online purchasing sites, which tend to allure customers with their flashy products and services; children can be easily targeted by them. A certain toy car could impel a child to steal his father's credit card to make an online purchase. An Internet filter software would ensure that a child does not fall prey to such cheap marketing strategies of these companies. Different kinds of internet filter software follow varied functions. Blocking or filtration can be performed according to the genre of the website; like all pornographic websites. Users can add a few websites in the filter software in order to block them. A varying order of filter can also be set up where by using password one can view a website that the other member of the family cannot. An internet filter is like a monitoring system that would not give access to a certain kind of websites to the children. Internet filter software can be bought or downloaded for free through various websites. An application like a web browser when created can have design flaws, deployment issues or improperly maintained. These could give the hacker or attacker an opportunity to attack. Hence, the first step towards application security is to have complete knowledge of the application. Once you know inside-out about the software, assess its vulnerabilities with a penetration test. When the degree to which the system is weak is known, you can select the right application security standard to cover the security holes so that the attacker is never able to exploit the application. There can be various ways in which application security can be maintained in your system. Installing firewalls can be of some help along with some internet filter, anti-spam, antivirus software or biometric testing systems. Documentation of every kind of threat visible in the software along with its management with a suitable security system is known as threat modeling. As treats are responsible for using up the resources of an application, threat modeling is beneficial in maintaining application security.