HTML-DivElement(s) The <div>tagis nothing more than a container unit that encapsulates other page elements and divides theHTMLdocument into sections. Web developers use <div> elements to group togetherHTMLelements and apply CSS styles to many elements at once.In this Course student will able to learn about difference concept of software engineering like Coupling and cohesion in software engineering and water fall model Sessionsare a simple way to store data for individual users against a uniquesessionID. This can be used to persist state information between page requests.SessionIDs are normally sent to the browser viasessioncookies and the ID is used to retrieve existingsessiondata.ThePOSTmethod transfers information via HTTP headers. The information is encoded as described in case ofGETmethod and put into a header called QUERY_STRING. ThePOSTmethod does not have any restriction on data size to be sent. ThePOSTmethod can be used to send ASCII as well as binarydata.Introduction to Operating SystemsA computer system has many resources (hardware and software), which may be require to complete a task. The commonly required resources are input/output devices, memory, file storage space, CPU etc. The operating system acts as a manager of the above resources and allocates them to specific programs and users, whenever necessary to perform a particular task. Therefore operating system is the resource manager i.e. it can manage the resource of a computer system internally. The resources are processor, memory, files, and I/O devices.In simple terms, an operating system is the interface between the user and the machine. student enjoy and learn in new concept of software engineering