What are ports in network ?

Is it a piece of codes, a program, if it is , who wrote that, i just want to know more deep in its behind the hood, but the sources i found either generalize it too much or dive so deep i dont see it yet. For example say port 80 and port 443, how the computer even begin to open it , who wrote it, where is it locate in memory, can you even change modify it . I know it super basics and stupid question. Thanks in advance

submitted by /u/tramquangpho
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from hacking: security in practice https://ift.tt/cOQvC82

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