Website??
The purpose of many websites are simply to provide information in some area of interest. some are educational in nature. There are also sites that specialize in news, sports information, medical information and such. Some of these sites may also promote or advertise the sponsoring company, as well as selling products.
Many companies originally set up their websites as a means to advertise and promote the products or services they provide. Now most have expanded their web mission to include providing customer support and selling their goods. Some also are including useful information about their products or area of interest.
Individuals may often set up personal web pages to promote themselves. These are vanity sites, where people may include pictures and material about themselves and their families. Sometimes they include a resume, if they are looking for a job.
Individuals and organizations may set up a website to promote some philosophy, concept or belief. Religious sites and non-profit organizations are examples of such sites. There are also sites by individuals that promote and organize various causes.