Public Data is information which is used be freely from any machine and it is the part social media sites which is used in normal form. In web development we are used that public data type which is be friendly with each other and the user can be freely used, reused and redistributed by anyone with no existing local, national or international legal restrictions on access or usage. In the enterprise, data can be classified as public if the information is available to all employees and all individuals or entities external to the corporation. Examples of Public Data in the enterprise include press releases, job descriptions and marketing materials intended for the general public. On the social networking web sites we can see the example of Public Data which in the form of user record data likes User name, Age and Address etc. In technically word Public Data is that data which is not work under some Constraints which are used restrict the some permission on data.