Can anyone explain Bulkhead policy in polly

/Setting the policy
var bulkHeadPolicy = Policy.BulkheadAsync < HttpResponseMessage > (10, 1);

//Defining it in Startup.cs
services
  .AddHttpClient < IContentfulManagementService, ContentfulManagementService > ((s, c) => {
    c.BaseAddress = new Uri(managementApiURL);
    c.DefaultRequestHeaders.Authorization = new AuthenticationHeaderValue("Bearer", managementApiKey);
    c.Timeout = timeout;
  })
.AddTransientHttpErrorPolicy(ErrorPolicy) .AddPolicyHandler(timeoutPolicy).AddTransientHttpErrorPolicy(retryErrorPolicy).AddPolicyHandler(bulkHeadPolicy);

//Retry when it errors out
private static Func < PolicyBuilder < HttpResponseMessage > , IAsyncPolicy < HttpResponseMessage >> retryErrorPolicy =>
  p => p.Or < BulkheadRejectedException > ().WaitAndRetryAsync(3, retryAttempt => TimeSpan.FromSeconds(Math.Pow(2, retryAttempt)));