In the area of online internet marketing, keyword plays the key role in the overall activities. And it's very important on how to use our keywords, because it brings a direct impact to our page views/sales/ conversions. In most cases, internet marketers use a great portion of time for the keyword research compared to the whole online campaign. The basic idea is to figure out the competitive keywords with lesser competition, high search volume , in order to make sure that we can have a higher ROI (Return on Investments) on the internet campaign.
Here is the examples on how importance is the keywords

The number of keyword searches per day
dog beds 653
dog bed 229
flowers 5266
flower 3996

If you don't know the difference for the search volumes, you may miss your target audience and waste your campaign budget on some keywords that are not that helpful.