A poster is a representation of an announcement, an advertisement, etc. A poster must be capable of catching the viewer's attention and must consist of necessary information that is to be communicated.
There is no format of a poster. However, here are a few points that you must keep in mind while making a poster:
- it should be appealing
- it should have catchy slogans or words
- it should be colourful
- information can be communicated through pictures or diagrams
- all important details must be conveyed
Hope this helps!