The measurement of TMDs allows to go beyond this one-dimensional picture. This entails that to measure TMDs, we need to gather more information from the scattering process. In DIS, only the scattered lepton is detected while the remnants of the shattered nucleon are ignored (inclusive experiment). Semi-inclusive DIS (SIDIS), where a high momentum (i.e. leading) hadron is detected in addition of the scattered lepton, allows us to obtain the needed additional details about the scattering process kinematics. The detected hadron results from the hadronization of the struck quark. This latter retains the information on its motion inside the nucleon, including its transverse momentum k T which allows to access the TMDs. In addition of its initial intrinsic transverse momentum k T the struck quark also acquires a transverse momentum p T during the hadronization process. Consequently, the structure functions entering the SIDIS cross-section or asymmetries are convolutions of a k T -dependent quark density, the TMD itself, and of a p T -dependent fragmentation function. Therefore, precise knowledge of fragmentation functions is important to extract TMDs from experimental results.