Party membership means different things in different systems.
Soviet/Chinese style communist parties were vanguard parties. Party membership was a privilege you had to earn, and it generally meant that you were a reputable person and potentially a member of the elite. In some sense, it had the same kind of signaling function as having a college degree or passing a leetcode interview.
American Democratic/Republican parties are kind of like semiofficial branches of the government. They have little control over their membership (or their candidates), and membership in itself means very little.
European political parties (at least in the countries I'm familiar with) are private organizations. Party membership tends to be lower than in the Soviet/American systems and signals some nontrivial commitment to the party.
Soviet/Chinese style communist parties were vanguard parties. Party membership was a privilege you had to earn, and it generally meant that you were a reputable person and potentially a member of the elite. In some sense, it had the same kind of signaling function as having a college degree or passing a leetcode interview.
American Democratic/Republican parties are kind of like semiofficial branches of the government. They have little control over their membership (or their candidates), and membership in itself means very little.
European political parties (at least in the countries I'm familiar with) are private organizations. Party membership tends to be lower than in the Soviet/American systems and signals some nontrivial commitment to the party.