Jihad is a concept that deserves clarification to non-Muslim as well as Muslims
The exact meaning of "Jihad" is "effort". Thus, in Islam, "to carry out jihad" is "to show effort, to struggle". The Prophet Muhammad explained that "the greatest jihad is the one a person carries out against his lower soul". What is meant by "lower soul" here is selfish desires and ambitions.
Assessed from the Qur'anic point of view, the word "jihad" can also mean a struggle carried out on intellectual grounds against those who oppress people, treat them unjustly, subject them to torture and cruelty and violate legitimate human rights. The purpose of this struggle is to bring about justice, peace and equality.
Apart from these ideological and spiritual meanings, struggle in the physical sense is also considered as "jihad". However, as explained above, this has to be a struggle carried out solely for defensive purposes. The use of the concept of "jihad" for acts of aggression against innocent people, that is for terror, would be unjust and a great distortion of the true meaning of the term.
Killing Oneself (Committing Suicide) is Forbidden in the Qur'an:
One of the main purposes of terrorist bombings, arson attacks and other such vicious acts is to create fear, anxiety, insecurity and a sense of panic in people.
Another important matter that arose in the wake of the latest terrorist assaults against the United States is that of suicide attacks. Some people who are ill-informed on Islam have made utterly erroneous statements to the effect that this religion of peace allows suicide attacks, whereas in Islam killing oneself and killing other people are both prohibited. In the words, "Do not kill yourselves." (Qur'an, 4:29) God has declared suicide to be a sin. In Islam it is forbidden for anyone to kill himself or herself, for no matter what reason.
Prophet Muhammad reveals suicide to be a sin in a parable, when he says that those who commit suicide will be punished:
"Indeed, whoever (intentionally) kills himself, then certainly he will be punished in the Fire of Hell, wherein he shall dwell forever." (Hadith reported by Bukharee & Muslim)
As this makes clear, committing suicide, and thus carrying out suicide attacks, and causing the deaths of thousands of innocent people while doing so, is a total violation of Islamic morality. God says in the Qur'an that it is a sin to put an end to one's own life. For that reason, it is quite impossible for someone who believes in God and says he abides by the Qur'an to do such a thing. The only people who can do such things are those who have a very mistaken perception of religion, have no idea of true Qur'anic morality, fail to use their reason and conscience, are under the influence of atheist ideologies, and who have been brainwashed with feelings of hatred and revenge. Everybody must oppose such actions