点击付费广告是最便宜简单的方式宣传您的产品或服务。在点击广告中，首要目标就是目标流量。你想吸引潜在的访客访问您的网页。如果他们是想找其他的东西，你当然不希望他们点击您的广告。若果他们点击你的广告，您便要支付费用。 如何避免这些非针对性的点击量？这就是负面关键字 (Negative Keyword)。
Google 的 Adwords 允许您添加负面关键字。在搜索查询中包含负面关键字，您的广告将不再出现，你可以远离那些非目标流量。您可能会担心负面关键字会导致更少的广告展示。是的，它可能会降低广告的展示，但它给您更为重要的东西，带来优质更配合你产合服务的访客。在AdWords博客，有一篇文章“Everything you ever wanted to know about negative keywords”谈及负面关键字。
以下是列出了一些常用的负面关键字。建议你套用这些负面关键字前，应逐一审查以确保它适合你的业务。
| General |
| game |
| games |
| map |
| maps |
| nude |
| porn |
| sex |
| sexy |
| Internet/Social Media |
| ebay |
| myspace |
| utube |
| you tube |
| Bargain |
| bargain |
| cheap |
| clearance |
| close out |
| close outs |
| closeout |
| closeouts |
| coupon |
| coupon code |
| coupons |
| discount |
| discounted |
| free |
| free sample |
| giveaway |
| inexpensive |
| liquidation |
| no charge |
| no cost |
| odd lots |
| overstock |
| promo code |
| promo codes |
| promotional code |
| promotional codes |
| samples |
| Job Seekers |
| career |
| careers |
| employment |
| hiring |
| intern |
| interns |
| internship |
| internships |
| job |
| jobs |
| recruiter |
| recruiting |
| resume |
| resumes |
| salaries |
| salary |
| Research Purpose |
| about |
| case study |
| class |
| classes |
| define |
| definition |
| diagram |
| example |
| examples |
| history |
| how to |
| info |
| information |
| meaning of |
| tutorial |
| what are |
| what is |
| wiki |
| wikipedia |
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