What is the maximum number of callouts that can be made from a single Apex transaction?

The limit for the maximum number of callouts that can be made from a single Apex transaction is 100. This limit is imposed to ensure efficient resource usage and maintain system performance, as each callout to an external service consumes resources and time. The ability to make up to 100 callouts per transaction allows developers to design robust integrations with external services while still adhering to Salesforce’s governor limits, which are in place to prevent a single process from monopolizing shared resources.

Having a clear understanding of this limit is crucial for developers when designing solutions that integrate Salesforce with other applications or services. Exceeding the callout limit would result in runtime exceptions, which could disrupt business processes. Therefore, strategies such as batching requests or optimizing integration points may be necessary to stay within this limit.