They are responding to the ease of browsing and purchasing from their home computer. Each of these sites provides links to many categories of on-line shopping. They are all good starting places for your first shopping venture. As you might expect, virtually all computer hardware and software companies have a commercial site for making purchases on the web. Many software companies also provide downloadable trial copies of their programs.
Many companies provide special pricing over the web.
Know what the regular price should be before assuming that it is a bargain. Many long-time computer users could not survive without a suite of programs to fix problems that arise. The well-known leader in the utilities area is Norton Utilities by Symantec. It is a comprehensive product. If you update your operating system, you will need to update this product.