der Damm
dam
A structure that blocks or holds back water, for example to form a lake or prevent flooding.
Der Biber hat einen Damm gebaut, der den Bach aufstaut.
The beaver built a dam that blocks the stream.

dam / embankment / perineum
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dam
A structure that blocks or holds back water, for example to form a lake or prevent flooding.
Der Biber hat einen Damm gebaut, der den Bach aufstaut.
The beaver built a dam that blocks the stream.

You can recognize the meaning of 'Damm' (dam / embankment / perineum) from the context. If it is about water, a river, or a lake, the structure is usually meant. In connection with words like 'Straße' (road), 'fahren' (to drive), or 'gehen' (to walk), it means the raised path.
Der Damm schützt das Dorf vor Hochwasser.
The dam protects the village from flooding.
A very common and vivid expression is 'der Damm bricht' (the dam breaks). This is often used when a barrier, literally or figuratively, suddenly gives way.
Nach tagelangem Regen brach der Damm und das Tal wurde überflutet.
After days of rain, the dam broke and the valley was flooded.
In a figurative sense, 'Damm' (barrier) is often used with the preposition 'gegen' (against) to describe a barrier against something negative and abstract. The pattern is: 'ein Damm gegen + [abstract noun]' (a barrier against + [abstract noun]).
Bildung ist der beste Damm gegen Armut.
Education is the best barrier against poverty.
The anatomical meaning of 'Damm' (perineum) is used almost exclusively in medical or biological technical language, for example in obstetrics or anatomy.
Der Arzt erklärte die Funktion des Damms während der Geburt.
The doctor explained the function of the perineum during childbirth.
rampart / embankment
'der Wall' and 'der Damm' can both mean a raised, artificially built embankment. Both can also have to do with protection against water. However, 'der Damm' is the more common word when a structure holds back or dams up water. It can also be a raised path or road. 'der Wall' sounds more like a long mound of earth, especially as a protective structure or in older contexts. The words can be confused especially in contexts of flooding and protective structures. If it is clearly about water, 'Damm' is often more natural; 'Wall' puts more emphasis on the shape or on the protective embankment.

Nach dem starken Regen kontrolliert die Feuerwehr den Damm am Fluss.
After the heavy rain, the fire department checks the dam by the river.
Hinter dem Dorf liegt ein alter Wall, der früher vor Überschwemmungen schützen sollte.
Behind the village there is an old embankment that was once meant to protect against flooding.