What an SDR does
A sales development representative works at the top of the funnel. Their job is to start conversations with people who might buy, find out whether there is a real fit, and hand the qualified ones to an account executive as a booked meeting. Most of the day goes on cold calls, emails and social messages, plus research on accounts and contacts. Some SDRs mainly follow up inbound leads, such as demo requests and content downloads; others work outbound lists. An SDR usually doesn't run demos, negotiate or close. Success is measured in meetings booked, and in how many of those meetings the account executive accepts as qualified.
Example
An SDR at a software company calls a head of operations, learns that her team re-keys orders by hand every week, confirms she owns the budget for fixing it, and books a 30-minute call with an account executive for Thursday. The AE takes it from there.
Why the role matters
Account executives are expensive, and their calendars are the bottleneck in most sales teams. SDRs protect that time by filtering out poor fits early and filling the calendar with conversations that can turn into pipeline. For the person in the seat, it is also one of the most common ways into a sales career. You learn to open conversations with strangers, handle brush-offs and qualify quickly, which are the same skills an AE needs later. Titles vary a lot between companies, and many use SDR and BDR for the same job.
How to practice the core skills
The SDR job is mostly the first minute of a call, repeated many times a day. Practice your opener, your reason for calling and one good qualifying question until they sound natural, then rehearse the brush-offs you will hear most, such as 'just send me an email' and 'we already use someone'. If you are interviewing for an SDR role, expect a mock cold call. Record a few practice runs and listen for filler words, rushed pitches and moments where you talked over the prospect.