What are the API limits for the SOAP API?

The API limits for the SOAP API primarily include concurrent and total API request limits. The concurrent limit refers to the maximum number of simultaneous requests that can be made to the API, ensuring that system resources are not overwhelmed and maintaining performance stability. The total API request limit refers to the number of requests that can be made over a specific time frame, typically measured in 24 hours. This is important to prevent excessive use that could lead to performance degradation for all users.

These limits are crucial for managing the load on Salesforce servers, thereby ensuring a smooth operation for all users and applications depending on the API. Understanding these constraints is essential for architects and developers when designing integrations, as surpassing these limits can result in errors or denials of service.

The other options do not encompass the broader context of API limits relevant to the SOAP API as a whole. File size limits, bandwidth limits, and connection limits may pertain to different aspects of data transfer or server connection but do not encapsulate the critical request limits tied to API usage.