Create a visually appealing thumbnail for a blog post titled 'What is the Main Role of Cybersecurity?' The thumbnail should feature a combination of modern technology elements such as a digital shield, a secure lock, and a network grid. Use a dark color palette with shades of blue and black to evoke a sense of security and professionalism. Include subtle hints of green to represent safety. The text 'Cybersecurity' should be prominently displayed in bold, futuristic font. Ensure the overall design is clean, professional, and eye-catching.

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