A drain that clogs once is usually just build-up: grease, soap scum, hair or food debris narrowing the pipe until water cannot get past it, cleared with a cable or snake and done. A drain that clogs again within a month, in the same spot, is telling you something different: either the line has a low spot where material keeps settling instead of flowing through, the venting is not working correctly and slowing drainage, or there is a partial obstruction further down that a quick snake only pushes past instead of removing.
That is the difference between clearing a drain and fixing one. A repeat clog gets the line itself looked at, sometimes with a camera, instead of being cleared the same way a third or fourth time with the same result a few weeks later.