The program committee may allocate special sessions of the conference to highlight selected papers for Oral or Spotlight presentations. Neurips has difference Oral and Spotlight presentations where the Oral presentations have a slightly longer presentation time than the Spotlight presentations.
At ICML every poster is given an oral talk opportunity. At NeurIPS, a selected few top papers are given the opportunity to give an oral talk. These are about 20 minutes each with some Q&A.
Five to ten minute previews of the posters; again a selected few top papers are given this opportunity.