ลงประกาศฟรี Online advertising encompasses a range of types of advertising, some of which are deployed ethically and some are not. Some websites use large numbers of advertisements, including flashing banners that distract the user, and some have misleading images designed to look like error messages from the operating system, rather than advertisements. Websites that unethically use online advertising for revenue frequently do not monitor what advertisements on their website link to, allowing advertisements to lead to sites with malicious software or adult material.
Website operators that ethically use online advertising typically use a small number of advertisements that are not intended to distract or irritate the user, and do not detract from the design and layout of their websites. Many website owners deal directly with companies that want to place ads, meaning that the website linked to by the advertisement is legitimate.
The overuse of technologies like Adobe Flash in online advertising has led to some users disabling it in their browsers, or using browser plug-ins like Adblock or NoScript. Many sites use centralized advertising services whose advertisement may be blocked as a side effect of security and privacy measures, because the services require JavaScript and cross-site requests to function, while such features are often not necessary to use the sites and are a potential source of vulnerabilities.
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