DLL Definition:

The full form of the term Dynamic Link Library is known as DLL. It is basically a shared library introduced by Microsoft. DLL is used in Microsoft Windows and OS/2 operating systems.

DLL contains code and data which enables it to be used by more than one program at the same time. DLL is helpful in code reuse and usage of memory in an efficient manner.

DLL Features

• DLL is similar to EXE.
• DLL needs an EXE to function/operate to load which is done through a gate or entry point.
• It is basically a mechanism for shared code and data.
• It helps to upgrade functionality without the necessity to be re-linked.

Advantages of DLL

• DLL helps to facilitate or promote modularization of code, code reuse, efficient memory usage.
• DLL reduces disk space.
• DLL helps the operating system and the programs load faster and run faster.
• DLL enables a particular program to be modularized into separate components.

Disadvantages of DLL

Overall, DLL is a versatile system. It has several advantages. However, DLL has a few disadvantages also which are:

• Application is not self-contained as it depends on the existence of a separate DLL module.
• Page fault is a disadvantage. This kills time and run time.
• DLL may not be available in all systems.
• DLL requires more space per node. 
• Another disadvantage of DLL is that Insertion and deletion take more time-consuming than a linear linked list.

The Conclusion:

In short, DLL or Dynamic Link Library is vital to the automatic updating of all relevant software and programming tools within the OS. If there’s any error within DLL, your PC may not operate properly and your screen will constantly display a series of errors and alerts.