Question about photos

I was so surprised to see that it is 7 days I have posted absolutely no posts :(
But I do try to curate at least every couple of days

This makes me feel sorry and also a little bit mad at myself, I hope that I will be able to do some better time management in the very near future. (or maybe just sleep less .. hahaha)

So, this time I am coming to ask a question, mostly from everybody that is a photographer (amateur or pro).

I have been loving photograph but did not have the means or the motive to shoot so much in the past

Lately, photograph has become a very important aspect of my work and of a few of my projects.

I have been also been inspired to shoot some people (randomly, without them knowing about it) ...

And my main question before I bore you to death is ...

tl;dr version of my today's post

Are we allowed to take photographs of people without their permission?

20190831_181336.jpg

To my defense, I would like to mention that I usually do it in a way that their face is not recognizable, or does not appear.
(And of course I try not to be seen when I 'shoot')

Looking forward to hearing your thoughts or experiences in this...
Thanks so much for your time :)

Thank you!