Global leaders at the G20 Summit in Brisbane, Australia.Reuters 
A closer shot of the leaders from US, UK, India and China.Reuters 
Leaders meet at the first plenary session at the G20 summit in Brisbane.Reuters 
G20 leaders applaud as they watch a "Welcome to Country" cultural performance at the G20 Leaders Summit.Reuters 
Peng Liyuan (C), wife of China's President XI Jinping, waves to a koala while on a G20 spouses visit to a koala sanctuary at the G20 leaders summit in Brisbane.Reuters 
Australian President Tony Abott Welcoming G20 leaders to an Australian BBQ.Twitter / Tony Abott 
Protesters, wearing masks depicting G20 leaders, and dressed as Australian surf lifesavers call for global equality among nations outside the venue site of the annual G20 leaders summit in Brisbane,REUTERS 
Hundreds of protesters participated in the event, held ahead of Saturday's G20 summit in Brisbane, which was being promoted as a message to Australian Prime Minister Tony Abbott?s government that, "You have your head in the sand on climate change".Reuters 
A protester dressed in protective equipment demonstrates, calling for for G20 leaders to address the Ebola issue, near the G20 leaders summit venue in Brisbane.Reuters 
Protesters supporting an independent Tibet lie on the ground holding placards as they hold a demonstration near the G20 leaders summit venue in Brisbane.Reuters 
The resounding billboard that didn't go unnoticed. Police guard cleared streets near the venue of the annual G20 leaders summit in BrisbaneReuters
Leaders from the Group of 20 member countries and other nations have arrived in the Australian city of Brisbane for the two-day Summit starting Saturday.
What is the G20 Summit?
The G20 Summit is an annual global leaders' meet where they discuss world economic order. During the year, finance ministers and government bank governors meet regularly to discuss ways to strengthen the global economy, reform international financial institutions and improve financial regulations
The G20 forum comprises of 19 countries and the European Union and the president of the forum invites guest countries each year. The G20 Leaders' Summit started in 2008 after the global financial downturn, and the meetings have helped bring the world economy on track to some extent.
The G20 has introduced several trillion dollars' worth of financial stimulus, which has helped the world economy through its initial stages of recovery. It aims for sustainable development and growth.
What will be Discussed at the 2014 G20 Summit ?
The 2014 G20 Summit will discuss the geopolitical tensions in Russia and Ukraine, and the Middle East crisis will probably dominate the talks.
Preliminary talks between US president Barrack Obama and European Council President Herman Van Rompuy suggest that "security" will be a major topic of discussion at the meeting.
Climate change and environment threats are also expected to be discussed at the G20 Summit. However, Australia is reportedly planning on sticking to the "global economy" script. The leaders plan to boost global economic growth by 2 percent in the next five years and creation of new jobs is also on the agenda, reports Reuters.
Global leaders are also discussing the Ebola threat and want all the countries to help fight the outbreak.
G20 Summit Protests
Masses have been gathering in Brisbane from nearby areas to stage protests and suggest topics that the leaders should discuss at the summit. The police is reportedly expecting 13 separate protests.
"Over the next three days you can expect to see a large number of these motorcades in the inner-city, in South Brisbane and in the vicinity of Brisbane Airport," Deputy Commissioner Ross Barnett was quoted by The Brisbane Times.
"This will undoubtedly be our busiest day as it's the first day of the formal meeting of the G20," he added. "We will just deal with the protest activity as it emerges tomorrow."
You can get live updates of the G20 Summit 2014 at ABC News.
