What is a poster? 

Literally, a poster is a large A0, A1, or A2 sheet that presents a research project or work-based project.  See the illustration here for comparative sizes. 

• Proposals for posters are submitted to prior to a conference and are peer reviewed before acceptance or rejection.  You need to look out for calls for proposals.
• Presenters are allocated an area of a conference or exhibition to hang posters.  At different times in the conference, delegates are encouraged to visit the area and meet presenters to discuss their content.
• Posters have to be presented in person.  However, they can be presented by one author on behalf of co-authors or a research team.
• Presenting a poster might entitle you to a reduced conference fee, but does not usually mean the fee will be waived.
• Posters can be home-made but are generally printed professionally.  You will need to meet the cost or secure funding for printing, c50 GBP.