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E-procurement primarily involves purchasing facilitated through the internet. This process leverages online platforms and tools to streamline and enhance the procurement process, improving efficiency and transparency. E-procurement systems automate purchasing tasks, allowing organizations to manage orders, track inventory, and interact with suppliers all via digital means.

By consolidating purchasing activities into a central online system, e-procurement also enables better analysis of spending patterns, supplier performance, and purchasing histories. This not only reduces administrative costs and time but also allows for more strategic sourcing decisions, making it a vital component of modern supply chain and operations management.

The other options do not encompass the full scope of e-procurement. Direct sales from manufacturers only describe a specific channel of purchasing and do not involve the broader range of online procurement processes. Negotiation for bulk purchases focuses on a specific strategy within procurement but does not cover the electronic methods utilized for purchasing. Seasonal discounting strategies relate to pricing tactics rather than the overarching framework of e-procurement.