Allah is the proper name of the One True God. Nothing else can be called Allah. This term has no plural or gendfer, which shows its uniqueness when compared with the word ‘god’, that can be made plural, gods; or feminine, goddess. It is a known fact that every language has one or more terms that are used in reference to God and sometimes to lesser deities. This is not the case with Allah.
Some of the biggest misconceptions that many non-Muslims have about Islam have to do with the word "Allah". For various reasons, many people have come to believe that Muslims worship a different God than Christians and Jews. This is totally false, since "Allah" is simply the Arabic word for "God" -- and there is only One God. However, it is certainly true that Jews, Christians and Muslims all have different concepts of Almighty God. For example, Muslims, like Jews, reject the Christian beliefs of Trinity and Divine Incarnation. However, this does not mean that each of these three religions worships a different God – because there is only One True God. Judaism, Christianity and Islam are classified as ‘Monotheistic’, however, Islam teaches that other religions have, in one way or another, distorted and nullified a pure and proper belief in Almighty God by neglecting His true teachings and mixing them with man-made ideas.