Immortality is eternal life, being exempt from death, unending existence.
Thank you for your question. The soul is immortal meaning that it will not be taken out of existence once Allah has brought it into existence. Death is not the annihilation of the soul but rather its transition from one plane to another. Allah has promised an eternity of bliss in heaven for those that follow His guidance and such a reward is only possible if the soul is immortal.
May you always be successful.
Soul is not immoral at all. There are three types of souls mentioned in Quran;
1. Al-Nafs Al-Ammarah which trends towards bad desires. This Nafs is to be avoided when it instigates towards bad. Allah (SWT) provided man with intellect (Aql) or reason to tackle the bad temptation. ونهى النفس عن الهوى فان الجنة هي المأوى
2. Al-Nafs Allawaamah which blames the person when and after doing bad to rectify him.
3. Al-Nafs Al-Mutma'innah which is in full peace and tranquility because of the high state of Imaan.