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Upgrade Path is the pathway of upgrades for a specific tower. Upgrade Path is either referred numerically (e.g. Path 1) or directionally (e.g. Top Path). Along each upgrade path is its respective upgrade tier. Upgrade paths were first introduced in Bloons TD 3.
In Bloons TD 5 Generation games, each tower has 2 upgrade paths. Up to Tier 2 can be applied to both paths, with one path going up to Tier 4. By convention, the upgrade paths under direction-oriented naming are typically referred as "Top Path" or "Bottom Path", in accordance with the upgrade menu format of Bloons TD 5 Mobile.
In Bloons TD 6 Generation games, each tower has 3 upgrade paths. Up to Tier 2 can be applied to 2 paths, with one path going up to Tier 5. Tier 5 Upgrades have special rules when upgrading, having a limit of one of the same Tier 5 upgrade (with exception of Crossbow Master with 
Master Double Cross, exclusive to BTD6). By convention, the upgrade paths under direction-oriented naming are typically referred as "Top Path", "Middle Path", and "Bottom Path". The final tier is Paragons, which at minimum require all Tier 5 upgrades of the same tower type to activate.
Trivia[]
- Ninja Kiwi's written notes for certain balance changes sometimes interchange between numerical notation and directional notation. An example of their use of numerical notation is in their Version 24.0 notes for a Blooncineration price buff. But more consistently when referring to different paths, Ninja Kiwi would use the directional notation to describe such.