I had blood test which shows low iron levels. is this anemia?

Not necessarily: Anemia refers to a low hemoglobin or hematocrit. If yours is low than you probably have iron deficient anemia and may benefit from iron supplements.

Iron deficiency: Iron deficiency is one type of several types of anemia. Anemia generally refers to low levels of hemoglobin/hematocrit. Iron deficiency can certainly cause this, but in and of itself, iron deficiency is not the same as anemia.