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Post-translational modifications (PTMs) have key roles in extending the functional diversity of proteins and as a result, regulating diverse cellular processes in prokaryotic and eukaryotic organisms. Phosphorylation modification is a vital PTM that occurs in most proteins and plays a significant role in many biological processes. Disorders in the phosphorylation process lead to multiple diseases including neurological disorders and cancers. The purpose of this review paper is to organize this body of knowledge associated with phosphorylation site (p-site) prediction to facilitate future research in this field. At first, we comprehensively reviewed all related databases and introduced all steps regarding dataset creation, data preprocessing and method evaluation in p-site prediction. Next, we investigated p-sites prediction methods which fall into two computational groups: Algorithmic and Machine Learning (ML). Additionally, it was shown that there are basically two main approaches for p-sites prediction by ML: conventional and End-to-End deep learning methods, which were given an overview for both of them. Moreover, this study introduced the most important feature extraction techniques which have mostly been used in p-site prediction. Finally, we created three test sets from new proteins related to the 2022th released version of the dbPTM database based on general and human species. Evaluation of the available online tools on the test sets showed quite poor performance for p-sites prediction. Keywords: Phosphorylation, Machine Learning, Deep Learning, Post Translation Modification, Databases