Tokenizing (when talking in a Blockchain environment), means to represent a right (personal, real, or un/tangible assets) in a DLT or Distributed Ledger Technology (concretely a public or hybrid Blockchain), being this assets represented in single account entries called tokens. Thus, said tokens will be linked to an e-wallet, which allow the owner to keep and transfer them. This tokens are hence usually transmissible and its rightful owner is the only one that can control it.
But this is not the only case of use. Nowadays, this technology allows to tokenize virtually everything and distribute it among the buyers of said token.
We can not forget to mention that there are many different type of tokens, and therefore its nature and selling ways are different in each case.