What are legacy systems?Optionsnone of the mentionedold systemsnew systemsunder-developed systems

Definition of Legacy Systems

Legacy systems refer to outdated or older computing systems, technologies, or applications that are still in use, often because they fulfill a critical function or have become deeply integrated into an organization’s operations.

Key Characteristics of Legacy Systems

1. Outdated Technology: They may run on old hardware or software platforms that are difficult to maintain.
2. Integration Challenges: Legacy systems often struggle to integrate with modern systems, making data sharing and process optimization challenging.
3. Maintenance Costs: Maintaining these systems can become costly over time due to the need for specialized knowledge and the high likelihood of technical debt.
4. Business Continuity: Despite their drawbacks, many organizations continue to use legacy systems because they are essential for daily operations.

Summary:

Legacy systems are essentially the "old systems" in the context of technology. They serve important functions within their respective organizations, but also come with various challenges, particularly in the realm of integration with newer systems and innovation in technological practices.

Final Answer:

The correct option is "old systems."