Binoculars are to birders as a glove is to a baseball player. While you could catch a fly ball without a glove, you'd do
it better and much easier with one.
Most birders use 7x35 or 10x40 binoculars. What do those numbers mean?
Check out this site for information about binoculars:
www.eagleoptics.com - Basic info about binoculars from a dealer specializing in them.