The intentional restriction of flow by partially closing or opening a valve. A wide range of throttling is accomplished automatically in regulators and control valves.

So, you tried to send a bunch of email, and when you checked your Event webhook or your Email Activity page, you see a number of messages are marked as “Deferred” instead of “Delivered”. Or maybe you’re looking at your Email Reports, and noticing a lot of addresses in your Blocks, but not many in your Hard Bounces. What? Why aren’t your recipients [..]

Your ISP might deliberately slow down or ‘throttle’ your internet connection if you breach your download limit, or if there is unusually heavy traffic.

Internet service providers may intentionally slow down a customer’s connection speed when they’ve reached a certain data threshold. Even uncapped ADSL accounts can be throttled if they exceed the acceptable usage limits. 

(n) the act of suffocating (someone) by constricting the windpipe

The automatic restricting or slowing down of a process based on one or more limits. Examples: Amazon Kinesis Streams throttles operations if an application (or group of applications operatin [..]

A throttle valve controlling fuel or gas flow to an engine.

The practice of regulating how many email message a broadcaster sends to one ISP or mail server at a time. Some ISPs bounce email if it receives too many messages from one sending address at a time. Transactional email

Modulating control as opposed to on/off control. (Learn More)

An irreversible adiabatic steady flow process in which the fluid is caused to flow through an obstruction in a pipe with a resulting drop in pressure.