Ektachrome is Kodak's brand name for a line of color slide film since the 1940s. The last of its line was discontinued in 2012, but revived with a new formulation in 2018. This new formulation is said to be optimised for scanning and not for projecting.
As typical for slide film, the exposure lattitude is narrow. Both highlights and shadows cannot be recovered, high contrast scences are challenging and should be avoided. Accurate metering a necessity. These difficulties are rewarded with a saturated, appealing color palette and fine detail without any visible grain, even in high resolution scans.