It is important that the copywrite be relevant to what people want to have, own or use. For example, offering a product that will save time, save money, increase profit, decrease loss or make life better is more likely to attract readers, viewers and listeners than the same product marketed to "make the earth a better place", although in reality that may be exactly what you are trying to do.
Copywriting is the process by which a company, business or individual attempts to market or sell they product through the development of advertising sites and campaigns that may include simple written text but may also have many different aspects such as graphics, logos, themes and even slogans and advertising phrases.