title: Rails -- gem installation
body: <p>Quick question about gem installation -- when I use <code>bundle install</code> I know it installs the gems necessary for my individual project, but it doesn't affect other projects on my computer.  If I use <code>gem install name_of_gem</code> would that also only affect the current project or would it affect all projects on my computer using rails (a generic installation)?  In general I think I am a little confused about how exactly gem installation works, so if your answer could include some general background information to help me understand this that would be great!</p>