There are several software programs that you can use to create a poster. When choosing a program, consider what software you have access to, what you are comfortable using, and whether or not you are willing to learn a new program.
Here are a few programs that you can use to make your poster:
Recommended program for creating posters. InDesign has page design and layout features that allow you to create a polished and professional poster.
Typically used for creating vector graphics, such as logos, diagrams and illustrations. Can be used to make posters, but not the preferred program.
Microsoft's program for page design and layout. Not as sophisticated as InDesign, but may be easier to learn how to use due to general familiarity with Microsoft products.
PowerPoint is easy-to-use and probably already installed on your computer. Can be used to make posters, but not the preferred program.