Religious differences: Israel is a Jewish country, while Iran is an Islamic country. There are obvious differences in religious beliefs between the two countries. Iran began to implement Islamic law after the Islamic Revolution in 1979, and Israel became the object of heresy in the process.
2. Geopolitical competition: There is geopolitical competition between Israel and Iran. Israel is a country with disputes with many Arab countries and Muslim countries, while Iran plays an important role in the Middle East, trying to expand its regional influence through conflicts with other countries. The two countries also compete for interests in Syria, Lebanon and other places.
3. Nuclear issue: Iran has been trying to develop its own nuclear technology, which has attracted Israel's attention. Israel is worried that Iran's development of nuclear weapons will threaten its own security, and has repeatedly said that Iran is not allowed to possess nuclear weapons. Israel has carried out military strikes against Iran's nuclear facilities in the past, while Iran claims that Israel is trying to undermine Iran's nuclear program.
4. Support hostile forces: Israel and Iran also support each other's hostile forces. For example, Israel supports Saudi Arabia, a hostile country of Iran, while Iran supports armed groups in Palestine and Lebanon, which further aggravates the tension between the two countries.
5. Economic competition: Both Iran and Israel are facing some similar challenges, such as energy security, cyber security and international economic sanctions. The economic competition between the two countries has also aggravated the conflict to some extent. For example, Israel may take action against Iran's competitors, or Iran may respond to Israeli interference by attacking Israel's interests.
Reference to the above content: Baidu Encyclopedia-Iran