What a private member's bill is
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A private member's bill is legislation introduced by an individual member of parliament who is not acting on behalf of the government, rather than being put forward as part of the official government legislative agenda, something that becomes clearer with experience, as is often the case in practice, even when the stakes seem relatively low.
Because these bills generally lack the guaranteed parliamentary time and resources that government legislation receives, many never progress past an early stage, though some do succeed, particularly on issues where cross party support exists independent of government priorities, though this can vary between jurisdictions, a pattern that recurs in many contexts.
Private member's bills often serve an important secondary purpose beyond their direct legislative content, allowing a backbencher to formally raise an issue, generate debate, and test the level of support it commands within the wider parliament, particularly when scrutiny is otherwise limited, which few people stop to consider.