  The study of identified particle production as a function of transverse
momentum ($p_{\text{T}}$) and event multiplicity in proton-proton (pp)
collisions at different center-of-mass energies ($\sqrt{s}$) is a key tool for
understanding similarities and differences between small and large collisions
systems. We report on the production of $\pi^{\pm}$, $K^{\pm}$, $K^{0}_{S}$, $p
(\bar{p})$, $\Lambda (\bar{\Lambda})$, $\Xi^{\pm}$ and $\Omega^{\pm}$ measured
in pp collisions in a wide range of center-of-mass energies with ALICE. The
multiplicity dependence of identified particle yields is presented for
$\sqrt{s} = \textrm{7}$ and $13$ TeV and discussed in the context of the
results obtained in proton-lead (p-Pb) and lead-lead (Pb-Pb) collisions,
unveiling remarkable and intriguing similarities. The production rates of
strange hadrons are observed to increase more than those of non-strange
particles, showing an enhancement pattern with multiplicity which does not
depend on the collision energy. Even if the multiplicity dependence of spectral
shapes can be qualitatively described by commonly-used Monte Carlo (MC) event
generators, the evolution of integrated yield ratios is poorly described by
these models.
