TMDs and Fragmentation Functions in e⁺ e⁻ - and Relation to the EIC

Fragmentation functions can be cleanly obtained from e⁺ e⁻ annihilation. In the recent years various measurements related to unpolarized, polarized and transverse-momentum dependent fragmentation functions have become available from the Belle, BaBar and BESIII experiments. These fragmentation functions are absolutely essential in extracting the spin and flavor structure of the nucleon and will play an important role in fulfilling the scientific goals of the electron-ion collider.