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SSA — SubStation Alpha Subtitle
SSA is the original SubStation Alpha subtitle format from the 1990s, the older version of ASS with styles and positioning.
SubStation Alpha was a Windows subtitle editor first released in 1996. Its SSA files store text, timing and styles in plain text; version 4+ of the format became ASS, which replaced it in Aegisub and in fansubbing.
Old SSA files still turn up with anime and archived films. Converting to ASS keeps the styles in the current format, and SRT or VTT gives plain subtitles that any player shows. Convert.Online reads SSA but does not write it.