How do you make an asynchronous callout from a trigger (@future(callout=true) vs Queueable)?

@future(callout=true): static void method, only primitive/collection-of-primitive parameters (pass Ids and re-query), no chaining, cannot be called from future/batch, no job Id returned.

Queueable + Database.AllowsCallouts: accepts SObjects/complex types, returns a job Id, supports chaining, can be monitored.

public class CalloutJob implements Queueable, Database.AllowsCallouts {
    Set<Id> ids;
    public CalloutJob(Set<Id> ids) { this.ids = ids; }
    public void execute(QueueableContext ctx) {
        // query by ids, make HTTP callout, update results
    }
}
// in trigger handler
System.enqueueJob(new CalloutJob(accountIds));

Prefer Queueable for new work.