If you are using Google Adwords then you need to understand that you can save money by using negative keywords.

Every search engine advertiser should be using negative keywords in a Pay Per Click (PPC) Campaign or Groups to remove the unwanted clicks.

An example of these are to remove job seekers, reference Keywords, research and statistics, educational, price shoppers and so on, unless you need this traffic.

Negative Keywords for Google Adwords:-

career
careers
employment
hiring
intern
interns
internship
internships
job
jobs
recruiter
recruiting
resume
resumes
salaries
salary
about
definition
diagram
example
examples
history
map
maps
sample
samples
what are
what is
association
associations
book
books
case studies
case study
guide
guides
journal
journals
magazine
magazines
metrics
news
research
review
reviews
statistics
stats
success stories
success story
tutorial
tutorials
white paper
white papers
class
classes
college
colleges
course
courses
education
school
schools
training
universities
university
bargain
clearance
close out
close outs
closeout
closeouts
discount
discounted
free
inexpensive
liquidation
odd lots
overstock
remainder
remainders
craft
crafts
create
creating
hand made
handmade
home
homemade
how to
make
making
burn
burner
cd
code
community
desktop
developer
developers
disk
download
downloads
dvd
error
file
files
forum
free
freeware
game
games
gnu
hack
hacks
libraries
library
open source
public domain
retail
retail
retailer
retailers
shareware
shortcut
shortcuts
template
templates
tip
tips
video
windows
microsoft
antique
consumer
export
exporter
exporters
hobby
import
importer
importers
measurement
model
models
regulations
rent
rental
repair
repairs
retail
retailer
retailers
rules
safety
specifications
specs
standards
store
toy
toys
used
vintage
act
act of
compliance
law
laws
legal
legislation
regulation
regulations
free