What is circumstantial evidence?

Circumstantial evidence refers a series of circumstances leading to the inference or conclusion of guilty, while; direct evidence is not available. It is the evidence from which the court may enter the existence of a fact in issue but which does not prove the existence of the fact in issue directly.

Is circumstantial evidence inferior to direct evidence?

If circumstantial evidence is clear good enough and reliable; it has same value as direct evidence. 

Note: In circumstantial evidence standard of proof is higher than direct evidence see Mpanduji vs. Republic.