What is leukaemia, condition that Bashar al-Assad's wife Asma is reportedly suffering from?

Asma al-Assad, wife of ousted Syrian President Bashar al-Assad, is reportedly battling acute myeloid leukaemia, an aggressive cancer of the bone marrow and the blood. The former first lady has previously battled breast cancer in 2019

What is leukaemia, condition that Bashar al-Assad's wife Asma is reportedly suffering from?
Asma al-Assad, wife of ousted Syrian President Bashar al-Assad, is reportedly battling acute myeloid leukaemia, an aggressive cancer of the bone marrow and the blood. The former first lady has previously battled breast cancer in 2019