What is the difference between adapter and converter?

Question

Do it yourself

Good day to all.
Task: to power the simplest LED flashlight from 1 LED from one AA battery. I googled, the network is full of schemes for such devices, however, I decided to look for ready-made boards on Aliexpress. From what I could find:
5V DC DC Converter Step Up Power Supply DC-DC Boos... and DC DC Boost Converter Step Up DC-DC Booster Step-u...
Q: What's the difference? The seller answered this question to me: "Read the description, my friend," but the input / output current and voltage values ​​\u200b\u200bof both boards are the same. Outwardly, they also look absolutely identical. My knowledge is not enough for me to determine the differences. You can help me figure it out and / or throw links to other DIY kits or boards that can help in solving my problem.

Answer 1

You made my day!
According to the links - a photo of the same board, only turned upside down. Where are your eyes, Maxim Kudryavtsev ?

Answer 2

This is the same.
Just a name made with SEO in mind

Answer 3

Nothing, these are two completely identical modules.

Answer 4

AA battery is not rubbish. Take Lithium type 18650 which is plentiful everywhere. and then go broke on batteries. And do this:
There are two modules, on the left is a charge controller with can protection, you can charge with anything, even with your phone charger. On the right is a DC-DC converter, actually to power your Leda. In the photo it is with a fixed voltage of 5V. Take it with a trimmer at the output, and then you don’t need anything else at all. One bank, two modules and one LED, well, wires. An example of a variable voltage module:
https://ru.aliexpress.com/item/1pcs-MT3608-2A-Max-...
The board on your link has a purpose that is completely inappropriate for you. It is for USB devices with very low consumption. And the seller did not even bother to indicate what it is on - on which microcircuit.
I myself, understanding the historical reasons for the established division of REA devices into categories, asked this question. :) The most correct answer is: the adapter adapts (For example, AC to DC), and the converter converts (For example, 3.7 lithium to 5V). :) And in fact, now in commodity items they are synonyms.