> ## Documentation Index
> Fetch the complete documentation index at: https://trigger-features-scheduled-tasks.mintlify.site/llms.txt
> Use this file to discover all available pages before exploring further.

# Regular tasks

> The simplest type of task which can be triggered from elsewhere in your code.

They are defined using the `task()` function and can be [triggered](/v3/triggering) from your backend or inside another task.

Like all tasks they don't have timeouts, they should be placed inside a [/trigger folder](/v3/trigger-folder), and you [can configure them](/v3/tasks-overview#defining-a-task).

## Example tasks

### A task that does an OpenAI call with retrying

Sometimes OpenAI calls can take a long time to complete, or they can fail. This task will retry if the API call fails completely or if the response is empty.

<Snippet file="v3/code/openai-retry.mdx" />

### A Task that sends emails in a sequence with delays in between

This example uses Resend to send a sequence of emails over several days.

Each email is wrapped in [retry.onThrow](/v3/reference-retry-on-throw). This will retry the block of code if an error is thrown. This is useful when you don't want to retry the whole task, but just a part of it. The entire task will use the default retrying, so can also retry.

Additionally this task uses `wait.for` to wait for a certain amount of time before sending the next email. During the waiting time, the task will be paused and will not consume any resources.

```ts /trigger/email-sequence.ts
import { Resend } from "resend";

const resend = new Resend(process.env.RESEND_ASP_KEY);

export const emailSequence = task({
  id: "email-sequence",
  run: async (payload: { userId: string; email: string; name: string }) => {
    console.log(`Start email sequence for user ${payload.userId}`, payload);

    //send the first email immediately
    const firstEmailResult = await retry.onThrow(
      async ({ attempt }) => {
        const { data, error } = await resend.emails.send({
          from: "hello@trigger.dev",
          to: payload.email,
          subject: "Welcome to Trigger.dev",
          html: `<p>Hello ${payload.name},</p><p>Welcome to Trigger.dev</p>`,
        });

        if (error) {
          //throwing an error will trigger a retry of this block
          throw error;
        }

        return data;
      },
      { maxAttempts: 3 }
    );

    //then wait 3 days
    await wait.for({ days: 3 });

    //send the second email
    const secondEmailResult = await retry.onThrow(
      async ({ attempt }) => {
        const { data, error } = await resend.emails.send({
          from: "hello@trigger.dev",
          to: payload.email,
          subject: "Some tips for you",
          html: `<p>Hello ${payload.name},</p><p>Here are some tips for you…</p>`,
        });

        if (error) {
          //throwing an error will trigger a retry of this block
          throw error;
        }

        return data;
      },
      { maxAttempts: 3 }
    );

    //etc...
  },
});
```

### Other examples

<Snippet file="incomplete-docs.mdx" />