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Correlations and fluctuations (the latter are directly related to the2-particle correlations) is one of the important directions in analysis ofheavy ion collisions. At the current stage of RHIC exploration, when thedetails matter, basically any physics question is addressed with help ofcorrelation techniques. In this talk I start with a general introduction to thecorrelation and fluctuation formalism and discuss weak and strong sides ofdifferent type of observables. In more detail, I discuss the two-particle $p_t$correlations/$\mpt$ fluctuations. In spite of not observing any dramaticchanges in the event-by-event fluctuations with energy, which would indicate apossible phase transition, such correlations measurements remain an interestingand important subject, bringing valuable information. Lastly, I show how radialflow can generate characteristic azimuthal, transverse momentum and rapiditycorrelations, which could qualitatively explain many of recently observedphenomena in nuclear collisions.Comment: 8 pages, 8 figures. Invited talk at 5th International Conference on  Physics and Astrophysics of Quark Gluon Plasma, February 8-12, 2005, Salt  Lake City, Kolkata, Indi

Heavy ion collisions: Correlations and Fluctuations in particle production