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In this review, after a general introduction to the effective string theory(EST) description of confinement in pure gauge theories, we discuss thebehaviour of EST as the temperature is increased. We show that, as thedeconfinement point is approached from below, several universal features ofconfining gauge theories, like the ratio $T_c/\sqrt{\sigma_0}$, the linearincrease of the squared width of the flux tube with the interquark distance, orthe Temperature dependence of the interquark potential, can be accuratelypredicted by the effective string. Moreover in the vicinity of thedeconfinement point the EST behaviour turns out to be in good agreement withwhat predicted by conformal invariance or by dimensional reduction, thusfurther supporting the validity of and EST approach to confinement.

Effective string description of the confining flux tube at finite temperature