In Jainism, there isn’t a standard concept known as “21 path parampara.” You might be referring to one of these possibilities:

• PathParmparā (paramparā = lineage or succession) in general: the guru–shishya (teacher–disciple) lineages through which teachings and practices are transmitted.
• The list of Tirthankaras: Jain tradition speaks of 24 Tirthankaras who established the spiritual path for different yugas. The idea of “21” does not correspond to the canonical count of Tirthankarās.
• Śrutiparamparā and Vinaya/Śaśtra traditions: different Jain communities (Śvetāmbara and Digambara) describe lineages or schools slightly differently, but again not with a fixed “21” count.

If you can share a bit more context (where you saw “21 path parampara,” or whether you mean a specific school, text, or lineage), I can give a precise Jain accuracy-focused explanation grounded in authentic sources.