# What is the difference between Qiskit Terra, Aer, Ignis and Aqua?

I am going through the Qiskit tutorials and they have an article on each of the above 4. however, As a beginner, I am not very clear. Could anyone share some insights on these?

Back in Qiskit 0.24 (around March 2021) Qiskit was organized in Elements, as KAJ226 points out. However, after 0.25, Aqua was broken up in domain specific packages and the Aqua deprecation process started. At the end of 2021, Ignis was also deprecated to be replaced by qiskit-experiments. The current Qiskit landscape looks roughly like this: