Have you ever approached before even presenting your resume to get a position in the business world?
Not right, the same applies to the modelling field. You can’t approach the modelling agencies without your professional portfolio.

A Professional portfolio is your model resume in this field.

Your portfolio or resume is what clients or modelling agency look into before shortlisting you.

It is a representation of who you are, how you appear, reveals your work experience, and your ability as a model. It’s your marketing material that the clients and modelling agency use in order to book the model for their work. It is important that the portfolio has to be recent and kept up to date with the model’s current look.

Models don’t get recognized without a portfolio. Because the clients will be unable to determine whether the models are suitable for the project.
This is an industry in which advertising agencies or leading brands will check the model’s appearance, hair color, optical eye color, height, etc.
Therefore, it is almost impossible for the model to get exposure without a portfolio.
To work as a professional model, you must be registered with a model agency, which offers castings and auditions from casting agents and advertisement companies. Your modelling agency should insist that in order to be represented on their websites, you must have done a professional portfolio.
Modelling agencies will usually be able to recommend a photographer or have their own in-house photographer who will do a model portfolio shoot for you.