Sometimes when people speak Chinese they pronounce "zh" more like "z", "ch" like "c", "sh" more like "s", etc. In other respects (sentence structure, words), it seems to be proper mandarin. An example from Silicon valley:
It seems like the person in a shirt is saying "zeige feicang zongyao" where it should be "zheige feichang zhongyao" (这个非常重要)
Is it an accent or dialect? What's it called?