The power granted by the legislature to the executive to make detailed rules, regulations, or bye-laws is known as delegated legislation.
Since legislatures may not have the time or expertise to draft all detailed provisions, they delegate this authority to the executive branch to frame laws that help implement and administer the primary legislation effectively.
Delegated legislation allows for flexibility and specialization, enabling authorities to make bye-laws that address specific issues within the framework set by the legislature.
Conclusion:
The bye-law making power granted to the executive by the legislature is called delegated legislation.