1>Aluminum electrolytic capacitors are divided into three subfamilies by the type of electrolyte:
· Non-Solid (liquid, wet) aluminum electrolytic capacitors 
· Solid manganese dioxide aluminum electrolytic capacitors 
· Solid polymer aluminum electrolytic capacitors.

Aluminum electrolytic capacitors with non-solid electrolyte are available in different styles, see pictures above from left to right:
· SMDs (V-chip) for surface mounting on printed circuit boards or substrates 
· Radial lead terminals (single ended) for vertical mounting on printed circuit boards 
· Radial pin terminals (snap-in) for power applications 

2>Production process:

3>Cathode &  Anode mark:

4>Electrolytic capacitors family tree:

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