Here are some points below which would clearly decipher the existence and future course of ISIS:

1.It is an off-shoot to Alqaeda, arose in early February.
2. It started from the northern part of Iraq; seized most of northern and congealed its steps in Syria too through border.
3. Formerly it was called 'Islamic state of Iraq and Al-Sham (ISIS). It has changed its name to 'Islamic State (IS) to let know its establishment of a caliphate system in entire Muslim world.
4. Many Islamist militants as well as European ones have joined IS.
5. It is now much more strong than Al-qaeda despite being its off-shoot.
6. Its leader 'Abu Bakr Al-Baghdadi' has declared himself as caliphate and the leader of all the Muslims of the world.
7. Tehrik-i-Taliban Pakistan has also inspired by its swiftness and rapid increase in its strength. Both the groups are now in contact with each other to spread more its threat to other regions too.
8. Al-qaeda hesitates and fears its existence in such a less time.
9. Pakistan is supposed to remain concern by TTP's full support to IS which could congeal its steps in Pakistan with probably such a short time.
10. US and its allies have prepared to launch air stirkes and ground offensive in Iraq and Syria to eradicate the threat of IS with the help of Arabs and Iraqi forces.
11. Its future course is that if US fails to combat IS and could not win the support of its allies, IS would emerge more extensively and with more menace.