The mark-up languages are used for visual description and visual description of the document structure. It enables easier handling of elements within the document. The most famous representatives of mark-up language are HTML, XHTML and XML. Each of these languages has its own language version that keeps up with the development of web applications and clients and web developer’s needs.
Collection of all data together with previous administration system makes one database. Administration enables easy manipulation of data within the database, modification, adding and deleting. In addition to the above mentioned programming languages (script language and mark-up language) in the process of manipulation of the data – relational query language that may be written in isolation or within the scripting language code also plays a part. The type of language for working with relational database is SQL but depending on the database (MySQL, SQL, Oracle, etc) uses a slightly different syntax.