Accenture is into Business consulting, IT consulting and Outsourcing dealing with strategy, change, process improvements, PMI etc. So the biggest direct competitors operating in all 3 fields are IBM and Capgemini. Deloitte and PA would also be strong competitors but they only do the first 2. in all work types (i.e. strategy, change etc) McKinsey, BCG and Bain are pure strategy consultancy and deal with mainly strategy in the 1st two but it is not rare when they are squeezed for work to advise on tactical operational issues.
As easy as this might seem, people screw this one up all the time. Come prepared to give a short blurb about yourself. Say your name, talk about your degree, talk about past work experiences, talk about your hobbies. Keep it smooth and short, probably under 2 minutes.